Modal verbs

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Modal verbs

The main ‘modal verbs’ (or ‘modals’) are

can, may, will, shall, must, could, might, would, should

Ought to, used to, dare and need are also used as modal verbs, but they have other uses as well

WHEN TO USE MODAL VERBS

Modals have several meanings, so you need to think about the meaning of the sentence as a whole to be sure that your choice of modal expresses exactly what you want to say The main ideas that modals are used to express are shown in the following sections

Permission

(="allowing" someone to do something)

If you want to give or ask for permission, use can or may May is more polite or formal than can

You can leave when the bell rings

Customers may purchase extra copies at half price

Could is a polite way of asking for permission

?Could I leave early today

Might is a very formal and old‑fashioned way of asking for permission

?Might I borrow your umbrella


Obligation

(="saying" what someone must do)

If you want to demand that something happens, or that someone does something (="to" express obligation), use must You can also use this idea about yourself, in order to express a sense of duty

The builders must finish the job today

We mustn’t leave the house before 6 o’clock

I must remember to bring my notebook


Intention

(="saying" what you are going to do)

If you want to say that you intend to do something, use will or shall You can emphasize the meaning of intention if you say the modal louder than the surrounding words

Shall is only used with the first person (I or we), and is much less common than will It is hardly ever used in American English

This letter says they will definitely give us our money back

I shan’t stay long

To express an intention at a time in the past, use would

I tried to explain, but nobody would listen

Use would if there are conditions controlling whether something will take place

I would leave tomorrow, if I had the money


Ability

(="saying" whether you are able to do something)

If you want to say whether someone is able to carry out an action, use can

Guy can speak Russian

?Can you remember her name

!I can’t find my shoes


When you put these sentences into the past tense, use could

He was late for school because he couldn’t find his bag

Use could if there are conditions controlling whether the event will take place

I could leave tomorrow, if I had the money


Possibility

(="saying" whether something is possible)

If you want to say that something is possible, use can or may May is more polite or formal than can

You can go by bus from London to Liverpool

You may find the manager is still there, if you go to the office now

If you want to suggest that the action is less likely to happen, use could or might If you use might, you mean that the action is especially unlikely

We could go by bus

(We might go by bus (="it" is possible, but only if there are no problems


Probability

(="saying" whether something is likely)

If you want to suggest that an event is likely to happen, use should or ought to It will probably take place, but you are not completely sure

They should have had our reply by now

If you take these tablets, you should be all right

We ought to be there by 6 o’clock

Desirability


(="saying" that something is the right thing to do)

If you want to say that you think it is a good thing for something to happen, use should or ought to If you think that it is a bad thing for something to happen, put these verbs into the negative

You should get the early flight, if you want to be in good time

You ought to see the doctor as soon as possible

You shouldn’t say things like that

You oughtn’t to have left the engine running


Necessity

(="saying" that something is necessary)

If you want to say that it is necessary for something to happen, use must

We really must go now

I must get my hair cut this weekend

If you want to express the opposite meaning (="it" is unnecessary for something to happen) use needn’t/need not or not need to

There’s plenty of time, so you needn’t worry

Don’t use mustn’t because this gives the meaning of obligation


Certainty

(="saying" that you are sure about something)

If you want to say that you are sure something is true, use must

You must be tired, after all your hard work

They must have left by now


To express the opposite meaning (="you" are sure something is not true) use can’t

You can’t be that tired ‑ you’ve only been working for an hour!

They can’t have left yet


Prediction

(="saying" what you think is going to happen)

If you want to say that something is certain to happen, use either will or shall As with the other uses of these words, shall tends to be found only with the first person (I or we), and is much less common than will Shall is very rare in American English

The cars will be there on time, I promise

There is no doubt that we shall win

HOW TO USE MODAL VERBS

(• Modal verbs are used with the basic form of the verb (="the" infinitive form, without ‘to’

You must pay now NOT You must to pay now

They can go home if they want NOT They can to go home if they want


• Modal verbs do not have an ‑s ending in the present tense of the third person singular -

He can speak French NOT He cans speak French

• Modal verbs do not use do in questions or negatives -

Can you remember her name? NOT Do you can remember her name

We must not be late NOT We don’t must be late

Should we lock the door? NOT Do we should lock the door


• Modal verbs do not have an infinitive, a past participle, or a present participle0 -

• In spoken English, you often use short forms when you use the modal verb in the negative

cannot → can’t
could not → couldn’t
will not → won’t
must not → mustn’t
shall not → shan’t
might not → mightn’t
would not → wouldn’t
should not → shouldn’t
ought not → oughtn’t

Mustn’t, shan’t, mightn’t, and oughtn’t are normal in British English, but American speakers usually say must not, shall not, might not, and ought not

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