接下来让我们看下what happen和what happened的用法区别： 1.词性：what happen是用原形动词happen构成的现在时短语，而what happened是用动词happen的过去式happened构成的过去时短语. 'happend' is a spelling mistake of happened. The helping verb have 2.
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表示“某地 (某时)发生了什么事”，常用“sth.+ happen +地点/时间”这一结构来表达，此时主语应是事情。例如： the story.
This is the present perfect, which is constructed using:
The past participle of the main verb the meaning is. Here, what's is the contraction of what has. What happened还是what's happenedwhat happened和what's happened都用于询问过去发生了什么事情，主要的区别在于语法和使用方式。what happened是一个过去时态的简单 Happened是一个完整的句子，简单过去时来表示过去发的事情。 它是一个独的句子，不需要其他文本或上下来支what's happenedwhat has happened的缩形式，使用现在完成表示去发生的事情对当前.
