情态动词没有时态,那么这句话的must是表达情态动词么?

1个回答

  • It must have rained yesterday

    昨天一定下过雨了.

    must 情态动词

    1.必须. you must study hard.

    2.禁止. You mustn't walk on the grass.

    3.可能性. 表示推测.“一定”

    1) must do/be. 对现在的动作或状态推测.

    He must be Tom.他一定是Tom.

    2) must be doing.对现在的正在进行的动作推测.

    Tom must be sleeping now. Tom 现在一定在睡觉.

    3) must have done.对过去的动作或状态推测.

    Tom must have stayed up yesterday.Tom 昨天一定熬夜了.

    否定形式 can not /could not