为什么有时happen用助动词进行提问,而有时则不用?如：What will happen...What happened...What did happen...What was happening.

分类: 作业答案 • 2021-12-19 16:33:06

问题描述：

为什么有时happen用助动词进行提问,而有时则不用?如：What will happen...What happened...
What did happen...What was happening.

答

这是由时态决定的.
What will happen 表示将来要发生什么.
What happened 表示之前已经发生了什么.
What did happen 没有这种用法,直接用what happened代替.
What was happening 是过去进行时,表示那个时候正在发生什么.