modal verbs (1) - tallinn universitymangel/modal verbs c1.pdf · i might be able to leave early....
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Modal verbs (1)
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Present and future ability
*can /can’t
*be (un)able to
E.g. Peter can ride a bike.
I can’t speak Japanese.
I can come out with you tomorrow night (a decision or plan made now about a future action)
Multitasking is something he’ll never be able to do.
I might be able to leave early.
She has always been able to work things out.
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Past ability
*could – general past ability
e.g. My grandmother could speak five languages.
*was/were able to – specific past ability
*managed
* succeeded in doing sth.
Firefighters were able to/managed to save/succeeded in saving everybody from the burning house.
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• could not = couldn’t
Used with both general and specific past abilities
It was considered normal if children could not read when they went to school.
I could not go to the lecture yesterday.
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Present certainty and likelihood
• Present certainty must /can’t/should/shouldn’t + do sth be doing sth The lights are on, he must be at home. (I’m sure he
is at home) His car is gone, he can’t be at home. (I’m sure he
isn’t at home) There’s light in his study, he must be working She can’t be travelling, her work started last week. BUT: mustn’t – only used with prohibitions
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should – when we are not certain, but think there are good reasons to think so.
Ask Jessica, she should know it.
Shouldn’t you be sitting an exam right now?
ought to – synonym to should
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• will /will not = must/can’t (we are certain of sth because it’s what is expected.)
‘There’s somebody coming.’ ‘That’ll be Mary.’
‘Lets’ go and have a bite.’ ‘No, the canteen won’t be open yet.’
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• Present likelihood
may, might, could + do sth
be doing sth
(might and could express a smaller probability.)
We may go to Japan this summer. (There’s a chance that we’ll go.)
BUT: don’t use question forms of ‘may’ with this meaning!
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Do you think the firm may lose money? (NOT May the firm lose money?)
It could/might rain later, but I don’t really think it will.
may not/might not
Isabelle may not/might not/mightn’t be at home yet. = it’s possible she isn’t
BUT: don’t use couldn’t in this meaning
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Can – to express typical behaviour or general possibility.
A female crocodile can lay 30-40 eggs.
Roads can be very slippery here in winter.
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Past certainty and likelihood
• Past certainty
must/can’t/couldn’t have + done
been doing
She must have missed the bus.(I’m sure she did.)
You must have been joking. (I’m sure you were.)
He can’t/couldn’t have said it.(I’m sure he didn’t.)
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• Past likelihood may/might/could/ have + done been doing Mary may/might/could have heard it from John. (There’s a chance that she did.) may not/might not or mightn’t have + done been doing BUT: not couldn’t in this meaning They may not/mightn’t have caught the train. (May-be
they didn’t)
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To express that sth is quite probable
• Could/may/might + well + present or past
He could well be at home by now.
They may well have lied you about it.
She might well be sleeping right now.
He may well have been waiting for hours.
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To express unreal past situations
• Should/ought to/could have + done
been doing
You should have been here an hour ago.(But you weren’t.)
I ought to have bought that car.(But I didn’t.)
I was so hungry I could have eaten a horse. (But I didn’t.)
Mark should have been standing there with us. (But he wasn’t.)
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Modal verbs (2) Obligation and necessity
PRESENT PAST
*must do *had to do
*have/has to do *needed to do
*need(s) to do
*have/has got to do
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Absence of obligation or necessity
PRESENT PAST
*do(es)n’t have to do *didn’t have to do
*do(es)n’t need to *didn’t need to do
*need not do *needn’t have done
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• need to can be used like a regular verb using auxiliaries do/does/did etc. in negative sentences and questions and the preposition ‘to’ as a synonym to ‘have to’
You need to appeal to a higher court.
Mary doesn’t need to answer this.
Do they need to know?
Why do you need to know?
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• need can be used like a modal verb in negative sentences and questions in present simple tense only.
He needn’t know about it.
Need I say more?
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Didn’t need to do and needn’t have done
• Patrick didn’t need to go to school last week. (He didn’t go to school last week because there was no need)
• You needn’t have bought any food, our fridge is stocked.
(you bought the food but it was in vain)
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Strong advice. Criticism
PRESENT PAST
*should/ought to do *should have done
*could/might do *ought to have done
*shouldn’t do *could have done
*might have done
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Strong advice
• Mike ought to/ should work harder.
• You could/might try something different.
• Brian shouldn’t give in so easily.
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Criticism
• Mary ought to have/should have handled the situation differently.
• You could have/might have told me first.
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Prohibition
PRESENT PAST
*mustn’t *was/were not
*can’t allowed to
*am/is/are not allowed to
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• Children mustn’t play with matches!
• We can’t go there without a previous appointment.
• We have never been allowed to use the gadget.
• Students were not allowed to use ditionaries at the exam.
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Past permission
• Could - only used with general permission
When we were children we could stay up long on New Year’s Eve
• Was, were allowed to – used with specific permission.
John was allowed to take the exam later.