因为difficult是宾语补足语,如果加上is,原句就会有两个谓语动词,一个是find
另一个是 is（这是不允许的,英文的单句中只允许有一个谓语动词）.
如果加上is可以这么说：He found that it is difficult to sleep.
He found it difficult to sleep.为什么is省略?
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