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Indicating permission

4.146 'Can' is used to say that someone is allowed to do something.

You can drive a van up to 3-ton capacity using an ordinary driving licence.

If you are giving permission for something, you use 'can'.

You can borrow that pen if you want to.

You can go off duty now.

She can go with you.

formal permission: 'may' 4.147 In more formal situations, 'may' is used to give permission.

You may speak.

They may do exactly as they like.

permission in the past 'could' 4.148 'Could' is used to say that someone was allowed to do something in the past.

We could go to any part of the island we wanted to.

WARNING 4.149 You cannot use 'can' or 'could' to say that someone will be allowed to do something in the future. Instead you use 'be able to'.

'Be able to' is dealt with in paragraphs 4.228 to 4.235.

Indicating unacceptability

4.150 Modals are often used in negative structures to say that an action is forbidden or unacceptable.

prohibition: 'cannot' 4.151 'Cannot' is used to say that something is forbidden, for example because of a rule or law.

Children cannot bathe except in the presence of two lifesavers.

We're awfully sorry we can't let you stay here.

prohibition: 'may not' 4.152 'May not' is used in a similar way to 'cannot', but is more formal.

If the publisher decides to opt for a net price, the retailer may not sell that book below the publisher's price.

Communion may not, on principle, be celebrated by one who is not ordained.

prohibition: 'will not' 4.153 'Will not' is used to tell someone very firmly that they are not allowed to do a particular thing. Usually, the speaker has the power to prevent the hearer from doing this thing.

'I'll just go upstairs.'—'You will not.'

Until we have cured you, you won't be leaving here.

prohibition: 'shall not' 4.154 'Shall not' is used to say formally that a particular thing is not allowed. 'Shall not' is often used in written rules, laws, and agreements.

Persons under 18 shall not be employed in nightwork.

Equality of rights under the law shall not be denied or abridged by the United States or by any State.

'Shan't' is used in a similar way to 'will not' and 'won't'.

You shan't leave without my permission.

prohibition: imperatives 4.155 You can also say that something is not allowed by using an imperative sentence. Imperative sentences are explained in paragraph 4.4 and in paragraphs 4.31 to 4.35.

undesirable actions: 'should not' 4.156 'Should not' is used to tell someone that an action is unacceptable or undesirable.

You should not take her help for granted.

You shouldn't do that.

You shouldn't b so unfriendly.

4.157 'Must not' is used to say much more firmly that something is unacceptable or undesirable.

You must not accept it.

You mustn't do that.

You mustn't breathe a word of this to anyone.

Interacting with other people

4.158 You often say things in order to get someone to behave in a particular way. For example, you may want someone to take a particular action, to accept an offer, or to give their permission for something to be done.

In these situations, modals are often used. The modal you choose depends on several factors. The main ones are:

• the formality or informality of the situation

• the relationship between yourself and the person you are speaking to

• the degree of politeness you want to show.

In particular situations, other factors can be important. For example, if you are making an offer or suggestion, the modal you choose may depend on how persuasive you want co be.

4.159 The following sections explain how to use modals in different situations.

Paragraphs 4.160 to 4.176 explain how to give instructions and make requests.

Paragraphs 4.177 to 4.185 explain how to make an offer or an invitation.

Paragraphs 4.186 to 4.193 explain how to make suggestions.

Paragraphs 4.194 to 4.199 explain how to state an intention.

Paragraphs 4.200 to 4.205 explain how to express unwillingness or a refusal to do something.

Paragraphs 4.206 to 4.214 explain how to express a wish.

Paragraphs 4.215 to 4.219 explain how to indicate the importance of doing something.

Paragraphs 4.220 to 4.226 explain various ways of introducing what you are going to say.

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