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what invariably happens is that a great mumber of things cho

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what invariably happens is that a great mumber of things choose to go wrong at
precisely the same moment.
请问, 这句话为什么是what happen开头,这属于什么句型,什么语法,请详解 也可以分析一下句子成分,或者这个句子用的是哪一块知识
what invariably happens is that a great mumber of things cho
What invariably happens 主语从句(用一个句子充当句子的主语)
is that a great mumber of things choose to go wrong at precisely the same moment.系表结构做复合谓语(系动词is后面的that引导一个表语从句)
再分析表语从句的成分:
that 引导词(不做任何成分,只是起引导一个表语从句的作用)
a great mumber of things 主语
choose 谓语
to go wrong 不定式做宾语
at precisely the same moment介词短语做时间状语