高中英语语法大全第一部分 词法（第六章 情态动词）

10.表推测的情态动词句子的反意疑问句

He must/may be in the room, isn’t he?

He can’t be in the room, is he？

He must have finished the work, hasn’t he?

He may have done the work last night, didn’t he?

 

  ：情态动词+行为动词进行式

    情态动词+行为动词进行式（即情态动词+ be + v-ing形式），表示推测或评论某动作现在是否正在进行。例如：

    1）He must be playing basketball in the room.

2）She may be staying at home.

11.情态动词+行为动词完成进行式

    情态动词+行为动词完成进行式（即情态动词+ have been + v-ing 形式），表示推测或评论过去某动作是否正在进行或一直在进行。例如：

    1）They should have been meeting to discuss the problem.

    2）He may / might have been buying stamps in the post office when you saw him.

12.used to +v, be used to +v-ing和be used to +v

   （1）used to +v意为“过去常常”，“过去一直”；be used to +v-ing / n（名词）意为“习惯于”；be used to +v意为“被用来（做某事）”。