Here, what's is the contraction of what has. I think happens is referring to a past action prior to the main clause,. The helping verb have 2.
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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. 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 past participle of the main verb the.
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Happen to 后面跟的是人名、公司、或其他集合名次和代名词what happened to you?it happens to everybody. Here's a list of texting abbreviations to help you succeed in any online talk. 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? Was the best thing that ever happened to me。 it brought me to you。 and i'mthankful， rose。 i'm thankful。 jack： you must do me this honor promise me you will survive that you will。.
This is the present perfect, which is constructed using: What happened 和 what's happened两者的区别： 是问 what happened？只是想知道过去所发生的事情， 而如果用what's happened？则强调对现在的影响。，即想知道过去所发生的什么事.
