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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. Here, what's is the contraction of what has. The past participle of the main verb the meaning is.

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I love teaching english has it happened to you that you have studied a lot and nothing has happened, don't worry anymore, since i will help you advance and achieve your goals by learning with fun.

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

The helping verb have 2. This is the present perfect, which is constructed using: 'happend' is a spelling mistake of happened. 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.