sure that i had passed(原句),但书上说,前面省了being,本来应该being sure that i had passed,

sure that i had passed(原句),但书上说,前面省了being,本来应该being sure that i had passed,

题目
sure that i had passed(原句),但书上说,前面省了being,本来应该being sure that i had passed,
请问为什么省,这是什么语法,如果不省的话,为什么要加一个being ,
答案
being sure that i had passed,是一个现在分词短语作状语(其中又包含了一个宾语从句的that i had passed),这个现在分词短语在逻辑上是系表结构的,它代替了一个状语从句:After/Because was sure that that i had passed,
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