English Dictionary

must

/ˈmʌst/

verb

(modal auxiliary, defective) To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate.

You must finish your homework before you can go out to play.

意味（1）

(modal auxiliary, defective) To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate.

If it has rained all day, it must be very wet outside.

意味（2）

(modal auxiliary, defective) To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a failure or negative consequence.

You must arrive in class on time. (the requirement is an imperative)

意味（3）

(modal auxiliary, defective) Used to indicate that something that is very likely, probable, or certain to be true.

The children must be asleep by now.