It can difficult to know happen
问题描述:
It can difficult to know happen
为什么要在can后加be,be有什么用
答
can 是情态动词,后面跟动词原形,而difficult 是形容词,所以必须在difficult 前必须加be .
be 作系动词,difficult 是表语,构成系表结构.
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