|must (1) /mst/
; weak form /mst/ auxiliary verb used with other verbs without the infinitive "to
expressing obligation: I must go to work tomorrow. 2
expressing the likelihood of s.t.: Her car is gone, so she must have left already. See: modal auxiliary. n.
s.t. necessary, a necessity: A warm winter coat is a must in Toronto.Thesaurus: must (1) auxiliary verb 1
to have to, ought to 2
probably, maybe.Usage Note:
Compare ought to, would, should,
The past tense of must
is usu. had to: I had to go to work yesterday.
Use must have & past part.
to indicate that you are quite sure s.t. happened: If the books are gone, Diane must have taken them.