The helping verb have 2. The past participle of the main verb the. There happened to be是由there be句型演变过来的，仍是there be结构； it happened to be.，意思是：结果碰巧是.
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'happend' is a spelling mistake of happened.
What happened?和what's happening?的区别是什么？ what happen?表示发生了什么，用于询问发生了什么事情，通常用于过去的事件或突发情况。
例句：there happened to be a telephone booth. 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 This is the present perfect, which is constructed using: When describing an event in the past speech, should i use present or past tense for happen.
Here, what's is the contraction of what has.
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