- must 必須做某事 ,
- musn't 不必須做某事，
- don't need to (過去式）不必須做某事
例句：
You don't need to go. You can stay here if you want.
It's fantastic film. You must see it.
It's lisa birthday next week . I mustn't forget to buy her a present.
【英語語法】情態動詞 must , mustn't , 和don't need to do 的用法
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