Apart from advice and necessity, modal verbs can also be used to express other feelings and purposes.
Modals of Prohibition
To prohibit something is to say that it is not allowed or acceptable. Modal verbs can often be used to express this. We can use modals of prohibition to talk about the present and the future:
- must not
- may not
- can't / cannot
We can also use modals of prohibition in the past tense. The only one of these modals is:
- couldn't / could not
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