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.

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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.

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.
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.

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.
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.

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