英語你我他文法篇75:must

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講義
must

必須；義務＝have to/have got to (過去式為had to)

(否定為need not/don't have to/don't need to)

We must (= have to) obey the law. 我們必須守法。

All the drivers must wear seatbelts. 所有的駕駛員都必須系安全帶。

The little boy must (= has to) keep quiet in the theater.

在戲院里小男孩必須保持安靜。

It's getting late. I really must go. 天晚了，我真的得走了。

Must I make a reservation in advance?

No, you needn't/don't have to.

Do I have to make a reservation in advance?

Yes, you do./No, you don't.

我必須事先訂位嗎？ 不必。