must – 网络|

He must "ve had on some really nice pants."

那他穿的裤子一定十分考究

He must 've had on some really nice pants.

他肯定穿了好看的裤子。

I must get down to work tonight, as I 've got exams next week.

今晚偶得开始认真复习功课，下星期要考试了We 've tried it three times. Must we try it a fourth time?

大家已经试过三遍了，还必须试一次(第四次)吗？ ？