A clear guide to using the in, on, and at prepositions. The past participle of the main verb the meaning is. The helping verb have 2.
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'happend' is a spelling mistake of happened.
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.
Learn the time and place to use each with helpful guidelines and examples. This is the present perfect, which is constructed using: Here, what's is the contraction of what has. Happened to /happened with 区别区别只有一点，就是指意不同：1、happen to sb“某人发生了某事”。可指坏事，也可指好事。例句：what's happened to her?
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. 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
