— Someone is knocking at the door. Who is it?
— It must be Leo. He said he'd come to see me.
【结论2】it指代人时,常指小孩或身份不明的人。
【例句观察】
It's too quiet in the room. Everyone just keeps silent.
【结论2】it可用以指代环境或情况。
【完成例句】
根据语境补全句子
(6)— What time is it now?
— It's half past seven.
(7)— It is spring now and it's warm these days.
【结论4】 it可用以指代时间、季节、天气或距离。
【注意】 it指代时间时,有如下一些句型:
(1) It is time for sth. (for sb.)to do sth. / that-从句(should do /
did, 必须用虚拟语气)
例: ① It's time for lunch.
② It's time for us to clean the house.
③ It's time that we should clean the house.
=It's time that we cleaned the house.
(2) It is
/ has been + some time + since-从句 (从句用一般过去时)
(3) It / This is the first
/ second…time that-从句(必须使用现在完成时)
这是某人第……次做了某事。
It /
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