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3. May is more ‘respectful’ than can and could: May I borrow your umbrella (please)?<br />

4. Might is the most polite but the least common: Might I borrow your umbrella (please)?<br />

5. We can add possibly and use expressions like Do you think and I wonder if to make<br />

requests even more polite:<br />

Can/Could/May/Might I possibly borrow your umbrella?<br />

Do you think I could/Do you think I might (possibly) borrow your umbrella?<br />

I wonder if I could/I wonder if I might (possible) borrow your umbrella?<br />

Give and refusing permission/Expressing prohibition<br />

We personally give or refuse permission in everyday situations in the following ways:<br />

You can (not) watch TV for as long as you like. (Not *could*)<br />

may (not) (Not *might*)<br />

We refer to ‘some other authority’ that gives/refuses permission like this:<br />

You can/cannot or You’re allowed to/not allowed to<br />

You can/cannot or You’re permitted to/not permitted to smoke here.<br />

You mustn’t or You’re forbidden to<br />

Permission/prohibition in tenses other than present and future<br />

May and must are not ‘complete verbs’, so we use be allowed to to make up their ‘missing<br />

parts’: <strong>The</strong> children were allowed to watch TV last night. (Not *could*)<br />

‘Can’ (= ability) and ‘can/could’ (= have permission, be free to)<br />

We use can/could in the sense of ‘am/is/are free to ‘to refer to the future:<br />

Mr Jones can/could see you tomorrow, if you ar free. Or Mr Jones is able to see you …<br />

But we must use will be able to (not *can/could*) to describe future ability:<br />

Baby will be able to stand up in two weeds’ time. (Not *can/could*)<br />

D. Uses of modals (etc.) to express certainly and possibility<br />

Certainly and possibility<br />

1. if we are certain of our facts, we use be or any full verb:<br />

Jane is at home. Jane works at home. (certain facts)<br />

2. If we are referring to possibility, we use may, might or could + be/have been:<br />

Jane may/might/could be at home now.<br />

She may/might/could have been at home yesterday.<br />

Or we use may, might, could + full verb:<br />

Jane may/might/could work (or … may/might/could be working) at home.<br />

She may/might/could have worked (or … have been working) at home yesterday.<br />

Certain and uncertain answers to questions<br />

1. A ‘certain’ question may produce an ‘uncertain’ answer:<br />

Does he like fish? – He might (do). He may (do). He could (do). He may not.<br />

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