It is no use crying over spilt milk.
3) 主语从句 a It +be +adj.+that… It is certain that everything will work out successfully due to our hard work. It is strange that he should not feel ashamed of his behavior. It is strange/surprising/important/necessary, +that + S + should +do…
——Who’s that over there? ——_It_’s__Helen.
— Whose pill is this？ — __I_t __is mine.
4.用来表示时间、天气、距离、自然环境，
地点、温度；抽象的环境.
1)It’s half past five now. (time)
2) It’s getting freezing cold. (weather)
➢ 也可能是wh-词引导的 It is still a question how many people
are to come to the meeting.
It is none of your business where I will spend this summer holiday.
It remains to be seen whether it will do the environment harm or good. 对环境有好处还是有害处, 还要等着瞧。 It (so) happens that …. It seems/ appears that … It happened that my grandad went out when the fire broke out.
3) It’s 10 minutes’ drive to the post office?(distance) 4) It was very quiet at the moment.(environment)
5) How is it getting along? (situation)
it作形式主语、形式宾语
大家应该也有点累了，稍作休息
大家有疑问的，可以询问和交流
1. 做形式主语
1) 不定式 It +be+adj.+ for (of) sb.+ to do…；
It is important for you to learn English well. It's generous of you to donate such a large amount of money to charity.
It + be+名词+to do… e.g. It is a good idea to quit smoking
before one becomes pregnant. 没有见到那位学者本人真可惜！ It is a pity/ shame not to see that
scholar in the flesh.
➢be+介词短语； It is against the law to sell cigarettes to
adolescents in Britain.
➢其他类型的谓语 It gives me great pleasure to see a movie.
It takes careful preparations to pass a job interview.
b It +is +n.+that… e.g. It is a pity/shame that he should get into the habit of abusing alcohol. __I_t _is__n_o_w__o_n_d_e_r___ that you are breathless; you have been walking for hours.
人教版选修6unit3grammar
it的用法 I. 人称代词 II.形式主语；形式宾语 III.用于强调句型中
it作人称代词
1. 用于指刚提到的事物，以避免重复。
1.The frog is not a warm-blooded
animal. It’s a cold-bsing. I can’t find __it___.
2) 动名词 It be+ no good/ no use/useless/ worth/
fun/a waste of … +doing… It is much fun working for Google.
In the opinion of many teachers, it is a waste of time playing computer games.
3 The adolescent is gaining weight, awndhi_c_ih_t__
worries his parents. 4.---Sorry, sir. There is only one blue tie available. Take __i_t__? ---No, thanks. I prefer a black __o_n_e___.
2. 用于指代人 1) 性别不明时
Look at the poor baby. __It__is crying again.
2)指代说话者不太清楚的那个人，常用在打 电话和敲门时。
e.g. — Who is knocking at the door？ — __I_t__is me.
3. 代替指示代词that, this
c It +is +said/ reported/ believed/ known to sb …that… e.g. It is said that the book has been translated into several languages. It +is+suggested/ordered/required/ insisted …that S+(should)+do… It is suggested that the students (should) build up their strength.