Summary of English Modal Verbs Practice

## Introduction English modal verbs are short auxiliary verbs that express ability, permission, obligation, possibility, and advice. They are essential for everyday conversation and writing. This lesson focuses on common modals: **can, could, may, might, must, should, need, mustn't, can't** and how to use them correctly. > Modal verbs are auxiliary verbs that modify the main verb to show ability, permission, obligation, or possibility. ## 1. What are modal verbs? - Modal verbs are followed by the base form of a verb (infinitive without "to"). - They do not take an "-s" for third person singular. - They form questions by inversion and negatives by adding "not" (or contraction). ### Examples - She **can** swim. (ability) - **May** I come in? (permission) - You **must** finish this. (obligation) ## 2. Breakdown of common modal verbs ### Can / Could - **Can**: ability or informal permission in present. - Example: I **can** speak English. - **Could**: past ability or polite requests/suggestions. - Example: When I was five, I **could** swim. ### May / Might - **May**: formal permission or possibility. - Example: **May** I use your phone, please? - **Might**: lower probability possibility or polite suggestion. - Example: We **might** leave early if traffic is bad. ### Must / Have to - **Must**: strong obligation or logical conclusion. - Example (obligation): You **must** finish your homework before watching TV. - Example (conclusion): She **must** be at home; the lights are on. ### Should - **Should**: advice or recommendation. - Example: You **shouldn't** eat so much sugar. It's unhealthy. ### Can't - **Can't**: strong negative possibility or impossibility. - Example: That **can't** be true! I don't believe it. ### Need - **Need** (as modal-like usage): necessity in questions/negatives. - Example: **Need** you open the window? It's hot. (more common: Do you need me to open...) ## 3. How to form sentences with modals - Affirmative: Subject + modal + base verb. Example: She **must** go. - Negative: Subject + modal + not + base verb. Example: You **shouldn't** eat too much. - Question: Modal + subject + base verb? Example: **May** I help you? > Use the base form after modals. For example: He **can speak** three languages, not He **can speaks** three languages. ## 4. Quick reference table | Meaning | Modals | Example | |---|---:|---| | Ability (present) | can | He **can** speak three languages. | | Ability (past) | could | I **could** swim when I was five. | | Permission | may, can | **May** I use your phone, please? | | Obligation / Necessity | must, have to | You **must** finish your homework before watching TV. | | Advice | should | You **shouldn't** eat so much sugar. | | Possibility (likely) | must | She **must** be at home; the lights are on. | | Possibility (unlikely) | can't | That **can't** be true! | | Polite request | could, may | **Could** you open the window? | ## 5. Practice with the given items (answer key explained) 1. You ______ eat so much sugar. It's unhealthy. — **A) shouldn't** (advice) 2. ______ I use your phone, please? — **B) May** (formal permission) 3. He ______ speak three languages. — **B) can** (ability) 4. You ______ finish your homework before watching TV. — **B) must** (obligation) 5. That ______ be true! I don't believe it. — **C) can't** (impossibility) 6. We ______ leave early if we want to catch the train. — **A) should** or **B) might** depending on nuance; best: **A) should** (advice/recommendation to achieve goal) 7. She ______ be at home; the lights are on. — **B) must** (logical conclusion) 8. ______ you open the window? It's hot. — **B) Could** (polite request) 9. Students ______ bring their books to class. — **A) must** (requirement) 10. I ______ swim when I was five. — **C) could** (past ability) Fun fact: Native speakers often use contractions with modals (like "can't", "won't", "shouldn't") in speech, making sentences sound more natural and conversational. ##