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Grammar

Revise Grammar for English 0510 (O Level) — revision notes and instant AI marking.

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Cambridge IGCSE Grammar

Master the essential grammar structures—tenses, voices, verb forms—so you can write and speak accurately in any context.

Quick Overview

📖 What You'll Learn

All the grammar structures tested in Cambridge IGCSE: tenses, passive voice, conditionals, modals, verb forms, and more.

🎯 The Big Picture

Grammar is the foundation for accurate writing and speaking. Master these structures and you'll avoid careless errors and score higher marks.

⏱️ Where It's Tested

Grammar appears in Writing (accuracy marks), Speaking (correct structures), and in specific grammar exercises throughout exams.

✅ Your Goal

Use correct structures confidently. Write error-free sentences. Know when and why to use each tense and form.

1. Tenses: The Foundation of Grammar

Why Tenses Matter

Tenses tell the reader when something happens: past, present, future. Using the wrong tense changes meaning and loses marks. This section covers the tenses you need.

The Tenses You Must Know

Present Simple

Form: Base verb (+ s for he/she/it). "I play." "She plays."

Use: Habits, facts, general truths, routines.

Examples: "I go to school every day." "Water boils at 100°C." "She works as a doctor."

Present Continuous

Form: am/is/are + -ing. "I am playing." "She is running."

Use: Actions happening NOW, at this moment.

Examples: "I am writing an email." "It is raining outside." "They are studying for exams."

Past Simple

Form: Base verb + -ed (regular) or irregular form. "I played." "I went."

Use: Completed actions in the past. No connection to present.

Examples: "I played football yesterday." "She went to Paris last year." "They finished the project on time."

Present Perfect Simple

Form: have/has + past participle. "I have played." "She has gone."

Use: Past actions with present relevance. Time not specified or recent. "Have you ever...?"

Examples: "I have lost my keys." (I don't have them now.) "She has worked here for 5 years." (Still working.) "Have you finished homework?"

Past Perfect

Form: had + past participle. "I had finished."

Use: Past action BEFORE another past action. Shows sequence.

Examples: "When she arrived, I had already left." (I left first, then she arrived.) "They had finished dinner before the guests came."

Future Simple

Form: will + base verb. "I will play." "She will go."

Use: Predictions, decisions made at speaking time, promises.

Examples: "I will help you." "It will rain tomorrow." "She will be a doctor."

First Conditional (If...will)

Form: If + present simple, will + base verb. "If I study, I will pass."

Use: Real, possible situations in the future.

Examples: "If you work hard, you will succeed." "If it rains, I will stay home." "If she calls, I will answer."

Tense Comparison: When to Use Each

Tense	Use	Example
Present Simple	Habits, facts, routines	"I eat breakfast every day."
Present Continuous	Actions happening NOW	"I am eating breakfast."
Past Simple	Completed past actions	"I ate breakfast earlier."
Present Perfect	Recent past with present relevance	"I have eaten already." (Not hungry now.)
Past Perfect	Past before past	"I had eaten before you arrived."

Practice Question 1: Choosing the Right Tense

Fill in the blanks with the correct tense:
1. "I _____ (go) to school every day."
2. "Right now, I _____ (study) for my exam."
3. "Yesterday, I _____ (finish) my homework."
4. "I _____ (live) in this town for 10 years."

2. Passive Voice: When to Use It

Active vs Passive: What's the Difference?

Active Voice (Subject does the action):

"The teacher marked the exam."
(Subject = teacher. Teacher is doing the action.)

Passive Voice (Subject receives the action):

"The exam was marked by the teacher."
(Subject = exam. Exam is receiving the action.)

💡 When to Use Passive:
1. The person doing the action is unknown: "The house was robbed last night." (We don't know who robbed it.)
2. The action is more important than who does it: "The bridge was built in 1950." (We care about the bridge, not the builders.)
3. Formal/official writing: "The patient was treated at the hospital." (More formal than "Doctors treated the patient.")

How to Form Passive Voice

Passive Formula: be (correct tense) + past participle

Present Simple: is/are + past participle. "The letter is written."

Past Simple: was/were + past participle. "The letter was written."

Present Perfect: has/have been + past participle. "The letter has been written."

Past Perfect: had been + past participle. "The letter had been written."

Future: will be + past participle. "The letter will be written."

Passive Voice Examples (Different Tenses):

Present Simple: "The building is cleaned every day."
Past Simple: "The building was cleaned yesterday."
Present Perfect: "The building has been cleaned today."
Future: "The building will be cleaned tomorrow."

Notice: Only the "be" verb changes. The past participle (cleaned) stays the same.

Practice Question 2: Converting Active to Passive

Change these active sentences to passive:
1. "The chef prepared the meal."
2. "Shakespeare wrote Hamlet."
3. "The company has hired new workers."

3. Modals & Special Verb Forms

Modals: Expressing Ability, Obligation, Permission, Possibility

Common Modals

can/could: Ability ("I can swim." "Could you help?") or permission ("You can go now.")

must: Obligation, strong necessity. "You must finish homework." "You mustn't be late."

should: Advice, recommendation. "You should study harder." "You shouldn't worry."

will: Future prediction, promise. "I will help you." "It will be sunny."

may/might: Possibility, permission. "It may rain." "You may go." "She might be late."

Remember: Modals are ALWAYS followed by base verb (no -ing, no -ed). "I can go" (NOT "I can to go").

Verb Forms: Infinitive, -ing Form, Bare Infinitive

Infinitive with "to"

Form: to + base verb. "to play," "to go," "to study"

Use after: want, hope, like, decide, try, manage, promise.

Examples: "I want to study medicine." "She decided to move abroad." "They promised to arrive on time."

Bare Infinitive (No "to")

Form: Base verb only. "play," "go," "study"

Use after: Modals (can, must, should), let, make.

Examples: "You must study hard." "I can speak French." "They let me leave early."

-ing Form (Gerund)

Form: Base verb + -ing. "playing," "going," "studying"

Use after: enjoy, like, start, finish, stop, suggest, avoid, consider.

Examples: "I enjoy reading." "She started learning piano." "They avoided making mistakes." "He suggested going to the cinema."

Practice Question 3: Verb Forms

Fill in with the correct form (infinitive with "to", bare infinitive, or -ing):
1. "I want _____ (study) medicine."
2. "You must _____ (complete) the project."
3. "She enjoys _____ (read) novels."
4. "He decided _____ (apply) for the job."

4. Common Grammar Errors & How to Avoid Them

❌ Error 1: Wrong Tense Sequence
Wrong: "When I arrived, he was leaving already."
Right: "When I arrived, he had already left." (Past perfect for action before another past action.)
Fix: Remember Past Perfect = past before past.

❌ Error 2: Modal + to infinitive
Wrong: "You must to study." "I can to swim."
Right: "You must study." "I can swim."
Fix: NEVER use "to" after modals. Bare infinitive only.

❌ Error 3: Present Perfect vs Past Simple
Wrong: "I went to Paris three times." (Uses past simple for recurring experience.)
Right: "I have been to Paris three times." (Present Perfect for experience.)
Fix: Use Present Perfect for experiences and recent actions. Past Simple for completed past events.

❌ Error 4: Passive Voice Article Error
Wrong: "The report was written by him very carefully."
Right: "The report was written very carefully by him." OR "He wrote the report very carefully."
Fix: Word order in passive can be awkward. Sometimes active is clearer.

❌ Error 5: Subject-Verb Agreement with "There is/are"
Wrong: "There is many problems."
Right: "There are many problems." (Agreement with "problems," not "there.")
Fix: "There is" = singular. "There are" = plural. Check the noun after "be."

❌ Error 6: Confusing "Have" and "Has"
Wrong: "He have finished." "She have completed it."
Right: "He has finished." "She has completed it."
Fix: has = he/she/it. have = I/you/we/they.

❌ Error 7: Article Errors (a/an/the)
Wrong: "I want a apple." "She is teacher." "The information is clear."
Right: "I want an apple." (Vowel sound = an.) "She is a teacher." (Countable noun needs article.) "The information is clear." (Information is countable here.)
Fix: "a" before consonant sound. "an" before vowel sound. Countable nouns need a/an or the.

5. Comparatives & Superlatives

Making Comparisons

Comparative: Comparing Two Things

Form: adjective + -er + than (short words) OR more + adjective + than (long words)

Short adjectives (-er): tall→taller, big→bigger, happy→happier

Long adjectives (more): beautiful, important, difficult, interesting

Examples: "She is taller than her brother." "This book is more interesting than that one."

Superlative: Comparing Three or More Things

Form: the + adjective + -est (short) OR the most + adjective (long)

Short adjectives (-est): tall→the tallest, big→the biggest, happy→the happiest

Long adjectives (most): the most beautiful, the most important, the most difficult

Examples: "She is the tallest in the class." "This is the most interesting book I've read."

Comparative & Superlative Comparison:

Adjective: smart
Comparative: smarter than. "Tom is smarter than Mike."
Superlative: the smartest. "Tom is the smartest student in the class."

Irregular Comparatives & Superlatives

Adjective	Comparative	Superlative
good	better	the best
bad	worse	the worst
far	further/farther	the furthest/farthest
little	less	the least
much/many	more	the most

Key Grammar Terms to Memorise

📍 Tense

The time of an action: past, present, or future. Shown through verb forms (go, goes, went, has gone, will go).

📍 Present Perfect

have/has + past participle. Used for past actions with present relevance or experiences. "I have lived here for 5 years."

📍 Passive Voice

be (correct tense) + past participle. Subject receives the action instead of doing it. "The book was written by the author."

📍 Past Participle

The third form of a verb, used in passive voice and perfect tenses. Regular: -ed (played). Irregular: written, gone, eaten.

📍 Modal

Special verbs (can, must, should, will, may) that express ability, obligation, permission, or possibility. Always followed by bare infinitive.

📍 Infinitive

Base form of a verb, often with "to": to study, to play, to go. Used after certain verbs like want, hope, decide.

📍 Gerund (-ing form)

Verb + -ing used as a noun: studying, playing, reading. Used after enjoy, like, start, finish, stop.

📍 Subject-Verb Agreement

Subject and verb must match: singular subject with singular verb, plural with plural. "He goes" (not "He go"). "They go" (not "They goes").

📍 Comparative

Comparing two things. -er than (short adj.) or more...than (long adj.). "She is taller than him."

📍 Superlative

Comparing three or more things. the...-est (short adj.) or the most....(long adj.). "She is the tallest."

Your Grammar Mastery Checklist

Tick these off as you master each concept.

I can identify and use Present Simple correctly for habits, facts, and routines.

I can identify and use Present Continuous for actions happening NOW.

I can identify and use Past Simple for completed past actions.

I can identify and use Present Perfect for recent actions with present relevance.

I can identify and use Past Perfect to show past before past.

I understand when to use Future Simple (will) for predictions and decisions.

I can form and use the First Conditional correctly for real future situations.

I can form passive voice in all tenses correctly: be + past participle.

I know when to use passive voice: unknown subject, action more important, formal writing.

I use modals correctly: can, must, should, will, may with bare infinitive.

I use infinitive with "to" correctly after want, hope, decide, try, etc.

I use -ing forms correctly after enjoy, like, start, finish, stop.

I can form and use comparatives and superlatives correctly.

I avoid common grammar errors: wrong tenses, modal + to, article mistakes, subject-verb disagreement.

I'm ready to use grammar accurately in all writing and speaking tasks!

Exam Tips: Grammar in Tests

✅ Tip 1: Check Tense Consistency

A piece of writing might start in past tense (story about yesterday) but shouldn't randomly jump to present unless there's a reason. Read your writing and ask: Do all verbs match the time period?

✅ Tip 2: Passive Voice in Writing

Formal writing (reports, essays) benefits from passive voice occasionally. But don't overuse it—too much passive sounds robotic. Balance: 70% active, 30% passive maximum.

✅ Tip 3: Modals and Speaking

In speaking exams, using modals correctly shows sophisticated language. "I might...," "You could...," "It should..." sound more fluent than just "I go," "You go."

✅ Tip 4: Check Subject-Verb Agreement

This error is caught by examiners immediately. "The teacher are..." = wrong. "Teachers are..." = right. Agree the subject with the verb.

✅ Tip 5: Use Varied Verb Forms

In writing, show you can use different verb forms. Don't write 10 simple past sentences in a row. Mix tenses naturally: past narrative, present reflection, conditional speculation.

✅ Tip 6: Watch Articles (a/an/the)

Article errors are common. Remember: "an apple" (vowel sound), "a cat" (consonant). Countable nouns usually need an article. Uncountable (water, information) often don't.

✅ Tip 7: Past Perfect for Clarity

When describing two past events, use past perfect for the earlier one. "When she arrived, I had already finished." This clarity impresses examiners.

✅ Tip 8: Proofread for Irregular Past Participles

Common mistakes: "I have went" (should be "gone"), "She has wrote" (should be "written"). Know your irregular verbs.

⚠️ What Loses Marks:

• Wrong tenses (changes meaning)
• Modal + to infinitive ("must to go")
• Subject-verb disagreement ("He don't")
• Incorrect passive voice formation
• Wrong infinitive/gerund form
• Article errors
• Inconsistent tense in narratives

Grammar Mastery Starts Now! 📚

Good grammar doesn't happen by accident—it's built through awareness and practice.

Next steps: Review one grammar concept per day. Write example sentences. Spot grammar in what you read. By exam time, these structures will be automatic.

Remember: Examiners reward accuracy. Master these grammar structures and you'll avoid careless errors that cost marks. You've got this!

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