Could, mustn't, needn't - English exercise

▶ Could, mustn't, needn't rules and examples

Could is a polite word used to ask for permission or to request something.

Could you pass me the tea?

Mustn't + infinitive = it is necessary not to do something.

negative - mustn't
I mustn't stop the car.

Needn't + infinitive = Require something because it is not very important.

I needn't stop the taxi (because it is not very important to do so).

Could, must, need with free online exercises, examples and sentences, questions and Could, must, need negative sentences.

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