话题 it作形式主语，不定式

话题 it is fun doing

话题 What does it matter?

话题 which it is expected

话题 It was a Sunday

话题 It (so) happened that…

话题 come to it cold

话题 It is nice doing

话题 it may be that

话题 Who was it that…

话题 Who was it who…

话题 It was后面接复数名词

话题 It doesn’t matter.

话题 it is known that...

问题 have it to fix是否正确

题干：My computer has gone wrong. I'll have it ____ tomorrow.  A. fixed  B. to fix问题如下：题目给出的答案是A，解析里说是因为 it 和 fix 是被动关系所以选用have sth. done。我觉得这种解释没有问题，但我认为 to fix 也是可以的啊，have sth. to do...