现在高三的同学们正处在高三复习的关键时刻，学习的效率和品质直接关乎高考的成败。英语更是高考中能够决定成败的一门。下面考高分教育的小编将为大家带来高中英语知识点：it句型，希望能够帮助到大家。
· it句型知识点
It用法及其句型和固定搭配讲解
三、It作主语的句型
1. It takes sb. to do（=sb takesto do）某人用多长时间做某事
例 It took the men a week to mend our roof.（= The men took a week to mend our roof.）
2. It's（just）（un）like sb. to do（不）像某人做某事的'风格
例 It was（just）like him to think of helping us.
3. It's（about/high）time that should /v-ed是该做某事的时候了
例 It's（about/high）time that we should take action.
4. It's the x-th time（that） have v-ed第几次做某事了
例 It's the third time that he has failed the driving test.
5. It is/has been since continuous v-ed（延续性动词）某动作已有多长时间不发生了
例 It's 10 years that he lived here
6. It was（not） before过（不）了多长时间某动作发生了
例 It was not long before they arrived.
· it句型典型例题
题目
I don’t think he could have done such a stupid thing last night, ?
A. do I
B. could he
C. did he
D. has he
答案
C 解析:
I think/believe. .的句型改为反意疑问句时，应与宾语从句在人称和时态上一致，同时应考虑到否定的前移。could have done为虚拟语气，变反意疑问句时需将时态还原，由“last night”可知用过去时，故选C。
