李小璐怀二胎没有:"What happen" is incorrect?

是错的，应该用what happened
注：Happen 的三种用法与三点注意

一、happen是不及物动词。happen在初中英语教材中的用法主要有以下三种：

1. "sth.+happen+地点/时间"，意为"某地/某时发生了某事"。例如：

An accident happened in that street.那条街发生了一起事故。

What's happening outside?外面发生什么事了？

2. "sth.+happen to+sb."意为"某人出了某事(常指不好的事发生在某人身上)"。例如：

A car accident happened to him yesterday.昨天他发生了交通事故。

What happened to you?(=What was wrong / the matter with you?)你怎么啦？

3. "sb.+happen+to do sth."意为"某人碰巧做某事"。例如：

I happened to meet her in the street.我碰巧在街上遇见她。

It happened that I was out when he called.他来访时我碰巧不在。

二、同学们在使用happen时，以下三点情况值得注意：

1. happen为不及物动词，不能用于被动语态。例如，要表示"这个故事发生在去年。"不能说：The story was happened last year.但可以说：The story happened last year.

2. happen为短暂性动词，不能与表示一段时间的状语连用。例如，要表示"这事发生一年了。"不能说：This happened for one year.但可以说：This happened one year ago.

3. happen一般用来强调某事发生的偶然性。如要表示事先安排或有准备的事情或活动，则不能用happen，而要用take place。例如：

A sports meeting took place(=was held) in our school last week.上周我校举行了运动会。(不能说：A sports meeting happened in our school last week.)

What's happened? =What has happened?
What's happening? =What is happening?
But "What happen" is incorrect

What happened. 是正确的

yes,\"what happen\" is incorrect
因为你问“发生了什么”，事情必定已经发生
所以what happened

what happen有三种理解：
what had happened什么事已经发生了（也表已经发生了的事，指过去的过去，语气要比下面一个强）
what has happened什么事发生了（一般指刚发生过了，可能过了一段时间了）
what happened刚刚发生了什么事，也是过去时，