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Can, could and be able to

The document discusses the use of modal auxiliary verbs can, could, and be able to. It explains that can is used to talk about present ability or possibility, could is used to talk about past ability or possibility, and be able to is used to talk about ability. It provides examples of how each modal verb is used and exercises for the reader to practice using them correctly.

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10 grade
Can is an auxiliary verb, a modal auxiliary verb. We use can to: talk about possibility and ability make requests ask for or give permission
subject auxiliary verb main verb + I can play tennis. - He Cannot/can´t play tennis. ? Can you play tennis.
We use can to talk about what is possible, what we are able or free to do: She can drive a car. John can speak Spanish. I cannot hear you. (I can't hear you.) Can you hear me?
Normally, we use can for the present. But it is possible to use can when we make present decisions about future ability. Can you help me with my homework? (present) Sorry. I'm busy today. But I can help you tomorrow. (future)
We often use can in a question to ask somebody to do something. Can you make a cup of coffee, please. Can you put the TV on. Can you come here a minute. Can you be quiet!
We sometimes use can to ask or give permission for something: Can I smoke in this room? You can't smoke here, but you can smoke in the garden. Note: We also use could, may, might for permission. The use of can for permission is informal.
Could is an auxiliary verb, a modal auxiliary verb. We use could to: talk about past possibility or ability make requests Structure of Could subject + could + main verb
subject auxiliary verb main verb + My grandmother could swim. - She could not/ couldn't walk. ? Could your grandmother swim?
We use could to talk about what was possible in the past, what we were able or free to do: I could swim when I was 5 years old. My grandmother could speak seven languages. When we arrived home, we could not open the door. (... couldn't open the door.) Could you understand what he was saying?
We often use could in a question to ask somebody to do something. The use of could in this way is fairly polite (formal): Could you tell me where the bank is, please? Could you send me a catalogue, please?
Be able to is not a modal verb. It is simply the verb be plus an adjective (able) followed by the infinitive. We look at be able to here because we sometimes use it instead of can and could . We use be able to : to talk about ability
subject + be + able + infinitive Subject Be main verb able adjective Infinitive + I am able to drive. - She is not / isn´t able to drive. ? Are you able to drive?
I was able to drive... I will be able to drive... I have been able to drive...
We use be able to to express ability. "Able" is an adjective meaning: having the power, skill or means to do something. If we say "I am able to swim", it is like saying "I can swim". We sometimes use "be able to" instead of "can" or "could" for ability. Note: "Be able to" is possible in all tenses - but "can" is possible only in the present and "could" is possible only in the past for ability.
I have been able to swim since I was five. (present perfect) You will be able to speak perfect English very soon. (future simple) I would like to be able to fly an airplane. (infinitive)
EXERCISES 1: Choose the correct modal. 1. _____ he understand what you were talking about? (can, could, be able) 2 My sister ______ play tennis now. (can, could, be able) 3 I ______ walk when I was less than a year old. (can, could, be able) 4 (Polite) ______ you tell me what time it is, please? (can, could, be able) 5 My grandfather _______ walk without any help last night. (can, could, be able)
EXERCISES 1: Choose the correct modal. 6 I would like to ______ play the piano. (can, could, be able) 7 How long have you _______ drive? (can, could, be able) 8 I'll _______ help you later. (can, could, be able) 9 Can you help me? I ______ never understand this. (can, could, be able) 10 Will Man ______ live forever one day? (can, could, be able)
HOMEWORK 1) Last week we ________ go swimming, this week we can't. (can/could/ be able) 2) Maybe the Smiths ______ build a new house next year. (can/could/be able) 3) If you try hard, you ______ pass your examinations. (can/coould/be able) 4) When I was five, I _______ swim. (not/can/be able) 5) Dennis _____ play the trumpet after four months. (can/could/be able)
HOMEWORK: 6) Luke has passed his driving test, now he _____ drive car. (can/could/be able) 7) For three weeks I ______ speak to him on the phone. (not/can/could/be able) 8) Alex ______ do his homework when his desk is in such a mess. (not/can/could/be able) 9) They were so busy, they_____ write me a text message. (not/can/could/ be able) 10) Lisa her dress. She ____ clean wear it again. (can/could/be able)