English grammar is not a set of rigid rules created to confuse you — it is a system that tells you how words work together to create meaning. Once you understand that system, you can speak confidently, write accurately, and understand anything you read or hear. This guide covers the complete journey: from the very first building blocks of English to the sophisticated structures used by advanced speakers and writers.
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📖 What's Inside This Guide
- Parts of Speech
- Nouns & Articles
- Pronouns
- Verbs & Verb Forms
- The Complete Tense System
- Adjectives & Adverbs
- Prepositions
- Conjunctions
- Sentence Types & Structure
- Clauses: Main & Subordinate
- Active vs Passive Voice
- Conditionals (Zero to Third)
- Reported Speech
- Modal Verbs
- 20 Most Common Grammar Mistakes
Chapter 1 · Basics
Parts of Speech: The 8 Building Blocks
Every single word in English belongs to one of eight categories called Parts of Speech. These categories tell you what a word does inside a sentence — not just what it means.
Noun
A person, place, thing, or idea.
dog, Delhi, happiness, book
Pronoun
Replaces a noun to avoid repetition.
he, she, it, they, we
Verb
An action or state of being.
run, think, is, become
Adjective
Describes or modifies a noun.
beautiful, tall, three, red
Adverb
Modifies a verb, adjective, or adverb.
quickly, very, never, there
Preposition
Shows relationship between words.
in, on, at, before, under
Conjunction
Joins words, phrases, or clauses.
and, but, because, although
Interjection
Expresses sudden emotion.
Oh! Wow! Ouch! Hey!
The word "run" can be a verb ("I run every morning"), a noun ("I went for a run"), or even an adjective ("a run-down building"). Context determines the category — not the word itself.
Chapter 2 · Basics
Nouns & Articles
Types of Nouns
| Type | Definition | Examples |
|---|---|---|
| Common Noun | General name for a person, place, or thing | city, teacher, river |
| Proper Noun | Specific name — always capitalised | Mumbai, Ravi, Amazon |
| Abstract Noun | Something you cannot touch or see | love, freedom, courage |
| Collective Noun | A group treated as one | team, flock, jury, herd |
| Countable Noun | Can be counted; has singular and plural | book → books, apple → apples |
| Uncountable Noun | Cannot be counted; no plural form | water, rice, information, advice |
Articles: A, An, The
Articles are special adjectives that come before nouns. Getting them right is one of the biggest challenges for learners.
| Article | When to Use | Example |
|---|---|---|
| a | Before singular countable nouns starting with a consonant sound | a book, a university (starts with /y/ sound) |
| an | Before singular countable nouns starting with a vowel sound | an apple, an hour (silent 'h') |
| the | Before specific or previously mentioned nouns; unique things | the sun, the book I told you about |
| no article | Before plural or uncountable nouns used in a general sense | I love music. Dogs are loyal. |
I saw a dog in the park. The dog was barking loudly.
(First mention → "a dog". Second mention → "the dog" because we now know which one.)
Chapter 3 · Basics
Pronouns
Pronouns replace nouns to make speech and writing more natural and less repetitive.
| Type | Examples | Use |
|---|---|---|
| Personal | I, you, he, she, it, we, they, me, him, her, us, them | Refer to specific people or things |
| Possessive | my, your, his, her, its, our, their; mine, yours, his… | Show ownership |
| Reflexive | myself, yourself, himself, herself, itself, ourselves, themselves | When subject and object are the same |
| Relative | who, whom, whose, which, that | Introduce relative clauses |
| Demonstrative | this, that, these, those | Point to something specific |
| Indefinite | someone, anybody, everyone, nothing, few, many | Refer to non-specific people or things |
| Interrogative | who, what, which, whom, whose | Used in questions |
❌ "Between you and I, this is wrong."
✅ "Between you and me, this is correct."
After a preposition (between, for, with, to, by), always use an object pronoun (me, him, her, us, them).
Chapter 4 · Basics
Verbs & Verb Forms
The verb is the engine of a sentence. Without a verb, you don't have a sentence — you have a fragment.
The Five Core Forms of Every Verb
| Form | Also Called | Example: "write" | Example: "go" |
|---|---|---|---|
| Base Form (V1) | Infinitive | write | go |
| Past Simple (V2) | Simple Past | wrote | went |
| Past Participle (V3) | Used with have/has/had | written | gone |
| Present Participle (V4) | -ing form | writing | going |
| Third Person Singular | He/She/It form | writes | goes |
Regular vs Irregular Verbs
Regular verbs follow a predictable pattern — just add -ed for V2 and V3:
work → worked → worked | play → played → played | visit → visited → visited
Irregular verbs change in unpredictable ways — these must be memorised:
| V1 (Base) | V2 (Past) | V3 (Participle) |
|---|---|---|
| be | was / were | been |
| break | broke | broken |
| choose | chose | chosen |
| drive | drove | driven |
| eat | ate | eaten |
| give | gave | given |
| know | knew | known |
| speak | spoke | spoken |
| take | took | taken |
| write | wrote | written |
Transitive vs Intransitive Verbs
- A transitive verb needs an object to complete its meaning: "She kicked the ball."
- An intransitive verb does not need an object: "The baby slept."
- Many verbs can be both: "She runs a business." (transitive) / "She runs every day." (intransitive)
Chapter 5 · Intermediate
The Complete English Tense System
English has 3 time frames (Past, Present, Future) and 4 aspects (Simple, Continuous, Perfect, Perfect Continuous), giving us 12 tenses in total.
- Simple Past
- Past Continuous
- Past Perfect
- Past Perfect Continuous
- Simple Present
- Present Continuous
- Present Perfect
- Present Perfect Continuous
- Simple Future
- Future Continuous
- Future Perfect
- Future Perfect Continuous
All 12 Tenses: Structure, Use & Example
| Tense | Structure | Use | Example |
|---|---|---|---|
| Simple Present | V1 / V1+s | Habits, facts, routines | She reads every day. |
| Present Continuous | am/is/are + V-ing | Action happening right now or around now | She is reading a book. |
| Present Perfect | have/has + V3 | Past action with present relevance | She has read that book. |
| Present Perfect Continuous | have/has + been + V-ing | Action that started in the past and is still ongoing | She has been reading for an hour. |
| Simple Past | V2 | Completed action at a specific past time | She read the book yesterday. |
| Past Continuous | was/were + V-ing | Action in progress at a past moment | She was reading when I called. |
| Past Perfect | had + V3 | Action completed before another past action | She had read the book before the film. |
| Past Perfect Continuous | had + been + V-ing | Duration of action before a past point | She had been reading for an hour before she slept. |
| Simple Future | will + V1 | Predictions, decisions, promises | She will read the report tomorrow. |
| Future Continuous | will + be + V-ing | Action in progress at a future moment | She will be reading at 8 PM. |
| Future Perfect | will + have + V3 | Action completed before a future point | She will have read the book by Friday. |
| Future Perfect Continuous | will + have + been + V-ing | Duration of action up to a future point | By June, she will have been reading for a year. |
The time (past/present/future) tells you when. The aspect tells you how the action relates to that time:
- Simple → the action as a complete fact
- Continuous → the action is in progress / ongoing
- Perfect → the action is complete before another point in time
- Perfect Continuous → duration of the action up to a point in time
Chapter 6 · Basics → Intermediate
Adjectives & Adverbs
Adjectives
Adjectives describe nouns. They answer: What kind? How many? Which one?
English adjectives follow a strict order of opinion when multiple adjectives are used together:
Opinion → Size → Physical Quality → Age → Shape → Colour → Origin → Material → Purpose
✅ "a beautiful little old rectangular green French silver whittling knife"
❌ "a green rectangular silver French old little beautiful whittling knife" (unnatural)
Degrees of Comparison
| Degree | Short Adjectives | Long Adjectives |
|---|---|---|
| Positive | tall, fast, smart | beautiful, intelligent |
| Comparative | taller, faster, smarter | more beautiful, more intelligent |
| Superlative | tallest, fastest, smartest | most beautiful, most intelligent |
Irregular comparisons: good → better → best | bad → worse → worst | far → farther → farthest | little → less → least
Adverbs
Adverbs modify verbs, adjectives, or other adverbs. They answer: How? When? Where? How much?
- Manner: slowly, carefully, quickly — "She spoke softly."
- Time: yesterday, soon, already — "I'll call you later."
- Place: here, there, everywhere — "Come here."
- Frequency: always, never, often, rarely — "He always arrives late."
- Degree: very, quite, almost, too — "This is very important."
❌ "She sings beautiful." (adjective cannot modify a verb)
✅ "She sings beautifully." (adverb modifies the verb "sings")
✅ "She has a beautiful voice." (adjective modifies the noun "voice")
Chapter 7 · Intermediate
Prepositions
Prepositions show relationships between words in a sentence — relationships of time, place, direction, cause, or manner.
| Type | Prepositions | Example |
|---|---|---|
| Place | in, on, at, under, above, between, behind, beside | The book is on the table. |
| Time | in, on, at, before, after, since, for, during, by | I'll see you on Monday. |
| Direction | to, into, onto, toward, through, across, along | Walk toward the river. |
| Cause / Reason | because of, due to, owing to, thanks to | Late because of traffic. |
IN / ON / AT — The Three Most Confusing Prepositions
| IN | ON | AT | |
|---|---|---|---|
| Time | in a month, in the morning, in 2025 | on Monday, on my birthday, on 5th June | at 8 PM, at noon, at night |
| Place | in a room, in Delhi, in a box | on the table, on the floor, on a bus | at the station, at home, at the door |
Chapter 8 · Intermediate
Conjunctions
| Type | What They Do | Examples |
|---|---|---|
| Coordinating | Join two independent clauses or words of equal value | for, and, nor, but, or, yet, so (FANBOYS) |
| Subordinating | Introduce a subordinate clause and show its relationship to the main clause | because, although, while, since, when, if, unless, until |
| Correlative | Work in pairs to connect equal elements | both…and, either…or, neither…nor, not only…but also |
Coordinating: I was tired, but I finished the work.
Subordinating: Although I was tired, I finished the work.
Correlative: Not only was I tired, but I was also hungry.
Chapter 9 · Intermediate
Sentence Types & Structure
The Core Sentence Structure
Every English sentence has at its core a Subject + Verb. Everything else is an addition.
"She gave him a book yesterday."
Subject → Verb → Indirect Object → Direct Object → Adverbial
Four Types of Sentences by Purpose
| Type | Purpose | Example | Punctuation |
|---|---|---|---|
| Declarative | Makes a statement | She is a doctor. | Full stop (.) |
| Interrogative | Asks a question | Is she a doctor? | Question mark (?) |
| Imperative | Gives a command or request | Open the window, please. | Full stop or (!) |
| Exclamatory | Expresses strong emotion | What a beautiful day! | Exclamation (!) |
Four Types of Sentences by Structure
| Structure | Definition | Example |
|---|---|---|
| Simple | One independent clause | She reads every night. |
| Compound | Two+ independent clauses joined by a coordinating conjunction | She reads, and he writes. |
| Complex | One independent + one+ subordinate clause | She reads because she loves learning. |
| Compound-Complex | Two+ independent + one+ subordinate clause | She reads, and he writes, because they love learning. |
Chapter 10 · Intermediate → Advanced
Clauses: Main & Subordinate
A clause is a group of words that contains a subject and a verb. Mastering clauses is the bridge between intermediate and advanced English.
Main (Independent) Clause
A main clause makes complete sense on its own. It can stand alone as a sentence.
"She passed the exam." — Complete thought. Can stand alone. ✅
Subordinate (Dependent) Clause
A subordinate clause cannot stand alone — it depends on a main clause to make sense.
| Type | Function | Introduced By | Example |
|---|---|---|---|
| Noun Clause | Acts as a noun (subject/object/complement) | that, what, who, whether, how | I know that she passed. |
| Adjective Clause (Relative Clause) | Describes a noun in the main clause | who, whom, whose, which, that | The student who studied hard passed. |
| Adverb Clause | Modifies the verb, showing time, reason, condition, contrast etc. | because, although, when, if, so that, unless | She passed because she worked hard. |
Defining vs Non-Defining Relative Clauses
| Defining (Restrictive) | Non-Defining (Non-Restrictive) | |
|---|---|---|
| Purpose | Identifies which one we mean — essential information | Adds extra, non-essential information about a noun already identified |
| Commas | No commas | Always surrounded by commas |
| "that" | Can use "that" | Never use "that" — use who / which |
| Example | The book that I lent you is rare. (which book? — the one I lent) | My first book, which I wrote in 2020, won an award. (we already know which book) |
Chapter 11 · Intermediate
Active vs Passive Voice
In the Active Voice, the subject performs the action.
In the Passive Voice, the subject receives the action.
| Tense | Active | Passive |
|---|---|---|
| Simple Present | She writes the report. | The report is written by her. |
| Simple Past | She wrote the report. | The report was written by her. |
| Present Perfect | She has written the report. | The report has been written by her. |
| Simple Future | She will write the report. | The report will be written by her. |
| Present Continuous | She is writing the report. | The report is being written by her. |
| Past Continuous | She was writing the report. | The report was being written by her. |
When to Use Passive Voice
- When the doer is unknown: "The window was broken."
- When the doer is unimportant: "The results will be announced tomorrow."
- In formal/academic/scientific writing: "The experiment was conducted under controlled conditions."
- When you want to emphasise the receiver of the action: "The president was elected by millions of voters."
Chapter 12 · Advanced
Conditionals: Zero to Third (+ Mixed)
Conditional sentences talk about results that depend on certain conditions. There are four main types — plus a mixed type for advanced use.
| Type | Condition Clause | Result Clause | Use | Example |
|---|---|---|---|---|
| Zero | If + Simple Present | Simple Present | General truths, scientific facts | If you heat water to 100°C, it boils. |
| First | If + Simple Present | will + base verb | Real, likely future situation | If it rains tomorrow, I will stay home. |
| Second | If + Simple Past | would + base verb | Hypothetical/unlikely present or future | If I had a million rupees, I would travel the world. |
| Third | If + Past Perfect | would have + V3 | Imaginary change to the past; regrets | If I had studied harder, I would have passed. |
| Mixed | If + Past Perfect | would + base verb | Past condition → present result | If I had taken that job, I would be rich now. |
❌ "If I would have known, I would have helped."
✅ "If I had known, I would have helped."
The if-clause always takes a past tense form — never "would."
Chapter 13 · Advanced
Reported Speech (Indirect Speech)
When you report what someone said without using their exact words, you use Reported Speech. The tense, pronouns, and time/place references all shift.
The Tense Shift Rule (Backshift)
| Direct Speech (What was said) | Reported Speech (What we report) |
|---|---|
| Simple Present: "I am tired." | Simple Past: He said he was tired. |
| Simple Past: "I went home." | Past Perfect: She said she had gone home. |
| Present Continuous: "I am leaving." | Past Continuous: He said he was leaving. |
| Present Perfect: "I have finished." | Past Perfect: She said she had finished. |
| Will: "I will help you." | Would: He said he would help me. |
| Can: "I can do it." | Could: She said she could do it. |
Reporting Questions
| Type | Direct | Reported |
|---|---|---|
| Yes/No Questions | "Are you coming?" | She asked if / whether I was coming. |
| Wh- Questions | "Where do you live?" | He asked where I lived. |
If the reporting verb is present tense, you do NOT need to backshift:
"The teacher says grammar is important."
(not "was important")
Chapter 14 · Advanced
Modal Verbs
Modal verbs are auxiliary verbs that express ability, possibility, permission, obligation, advice, or deduction. They are followed by the base form of the main verb (no -s, -ing, or -ed).
| Modal | Primary Use | Example |
|---|---|---|
| can | Ability (present); informal permission | I can speak three languages. |
| could | Ability (past); polite request; possibility | Could you help me? / It could rain. |
| will | Future prediction; intention; willingness | I will call you tonight. |
| would | Polite requests; hypothetical; past habit | I would love to join. / He would walk to school every day. |
| shall | Formal future (I/we); offers; suggestions | Shall we begin? |
| should | Advice; expectation; mild obligation | You should see a doctor. |
| may | Formal permission; possibility | You may leave now. / It may rain. |
| might | Weak possibility; polite permission | I might come to the party. |
| must | Strong obligation; logical deduction | You must wear a seatbelt. / She must be tired. |
| ought to | Moral obligation; advice (slightly formal) | You ought to apologise. |
| need not | Absence of obligation | You needn't come if you're busy. |
| dare | Courage / boldness (mostly negative/question) | How dare he say that? |
Modal Perfects: Talking About the Past with Modals
| Structure | Meaning | Example |
|---|---|---|
| should have + V3 | Regret or criticism about the past | You should have called me. (but you didn't) |
| could have + V3 | Past possibility that didn't happen | She could have won. (but she didn't try) |
| would have + V3 | Hypothetical past result | I would have helped if you'd asked. |
| must have + V3 | Strong deduction about the past | He must have left early. (I'm sure) |
| might have + V3 | Weak possibility in the past | She might have forgotten. |
| needn't have + V3 | Did something unnecessarily | You needn't have bought food — I cooked. |
Chapter 15 · All Levels
20 Most Common Grammar Mistakes — And How to Fix Them
These are the mistakes most English learners make — and most native speakers notice. Learn them once, avoid them forever.
| # | Wrong ❌ | Correct ✅ | Rule |
|---|---|---|---|
| 1 | I have seen him yesterday. | I saw him yesterday. | Specific past time → Simple Past |
| 2 | She is more smarter. | She is smarter. | Never use "more" with -er adjectives |
| 3 | He do not like it. | He does not like it. | He/She/It → does in negatives |
| 4 | I am knowing the answer. | I know the answer. | Stative verbs don't take -ing |
| 5 | Between you and I… | Between you and me… | After prepositions → object pronoun |
| 6 | Its raining. | It's raining. | It's = it is; its = possessive |
| 7 | I will call you, if I need. | I will call you if I need to. | Don't omit objects of "need/want" |
| 8 | The informations are useful. | The information is useful. | "Information" is uncountable — no plural |
| 9 | She explained me the plan. | She explained the plan to me. | "Explain" needs a preposition before the indirect object |
| 10 | Since 3 years. | For 3 years. | Since = a point in time; for = a duration |
| 11 | I am agree. | I agree. | "Agree" is a verb, not an adjective |
| 12 | He suggested me to go. | He suggested that I go. / He told me to go. | "Suggest" cannot be followed by object + infinitive |
| 13 | I did a mistake. | I made a mistake. | Collocation: make a mistake, not do |
| 14 | Less people came. | Fewer people came. | Fewer = countable; less = uncountable |
| 15 | Who did you meet? — I met John and she. | I met John and her. | Object pronoun after verb |
| 16 | I didn't ate anything. | I didn't eat anything. | After "did/didn't" → base verb (V1) |
| 17 | The news are bad. | The news is bad. | "News" is singular |
| 18 | He is more tall than her. | He is taller than her. | Short adjectives → -er, not "more" |
| 19 | I have 20 years. | I am 20 years old. | Age uses "to be" in English |
| 20 | She told that she was coming. | She said that / She told me that she was coming. | "Tell" needs an object; "say" does not |
⚡ Master Quick Reference
| Topic | Key Formula / Rule |
|---|---|
| Sentence Core | Subject + Verb (everything else adds detail) |
| Simple Present | V1 (add -s/-es for he/she/it) |
| Present Perfect | have/has + V3 |
| Past Perfect | had + V3 |
| Passive Voice | be (correct form) + V3 |
| Zero Conditional | If + Present, Present |
| First Conditional | If + Present, will + V1 |
| Second Conditional | If + Past, would + V1 |
| Third Conditional | If + Past Perfect, would have + V3 |
| Reported Speech | Tense shifts one step back into the past |
| Stative Verbs | know, believe, love, hate, want, seem — never use -ing |
| Articles | a/an (first mention) → the (known/specific) → Ø (general) |
Summary: Your Grammar Journey at a Glance
- English grammar is built on 8 parts of speech — know what each word does, not just what it means.
- Nouns name things; pronouns replace them; verbs give them action; adjectives and adverbs describe.
- The 12 tenses are created by combining 3 time frames with 4 aspects — learn the pattern, not each tense separately.
- Clauses are the building blocks of complex sentences — a main clause stands alone; a subordinate clause depends on it.
- The passive voice shifts focus from doer to receiver and is built with be + past participle.
- The four conditional types move from real facts to imaginary pasts — each has a strict structure.
- Reported speech shifts the tense one step back and changes pronouns and time words.
- Modal verbs express shades of meaning (ability, possibility, obligation, deduction) that no other verbs can.
- Grammar is not about memorising rules — it is about understanding how English thinks.
You have just covered the complete architecture of English grammar. The next step is deliberate practice: write one sentence using each tense today. Write one conditional of each type. Report a conversation you had. Grammar becomes fluency only when you stop thinking about it — and that happens through use, not memorisation. Start writing.