must

必须、得、一定要

You must submit the application before the end of the month.

你必须在月底前把申请书送出去。

一定、想必表推测

She must be tired after driving for eight hours.

开了八个小时的车，她一定累了。

不可以、不准用于否定句

You mustn't tell anyone what you saw in there.

你不可以把在里面看到的事告诉任何人。

一定要、务必表强烈建议

You must try the noodles at that little shop.

你一定要试试那家小店的面。

必需品、必做之事、必看之物口语

A good raincoat is a must during the rainy season.

雨季里一件好雨衣是必需品。

葡萄汁酿酒

The must is left in oak barrels to ferment slowly.

未发酵的葡萄汁放在橡木桶里慢慢发酵。