2021-12-18

may 请求，允许

肯定：can 可以／may

否定：can't 不能 ／mustn't 禁止

【例句】

May I fish here?

——Sorry, you mustn't .Look at the sign“No fishing!”

跟规则相关用must

Must I finish my homework now?

——No, you needn't . You can have a rest.

must 提问，肯定must 答

否定needn't /don't have to* 答

【例句】

Must I hand in the poster to day?

——No, you needn't.

Must I finish the work today?

——No, you needn't .But you must finish it before next Monday.

【例句】

Must I finish the work now?

——No, you don't have to .You can do it in the evening.