it seem certaim that their plane would crash 请问 it指的是什么 如果指的是飞机 那么何必多此一举直接把飞机调到开头不就行了

it seem certaim that their plane would crash 请问 it指的是什么 如果指的是飞机 那么何必多此一举直接把飞机调到开头不就行了
it seem certaim that their plane would crash 请问 it指的是什么 如果指的是飞机 那么何必多此一举
直接把飞机调到开头不就行了

it seem certaim that their plane would crash 请问 it指的是什么 如果指的是飞机 那么何必多此一举直接把飞机调到开头不就行了
it是形式主语,真正的主语是that后面的主语从句.
若写成That their plane would crash seems certain.就清楚了.这样用it在句首作形式主语,防止句子头重脚轻.另外你打错字了.It seems certain that their plane would crash.

形式主语嘛