2020屆高考英語名詞性從句語法復習

（3）who will be our monitor hasn't been decided yet.
（4） whom we must study for is a question of great importance.
（5）what caused the accident remains unknown.
（6）whatever you did is right.
（7）who the watch belongs to was lost is unknown.
（8）what we need is time.
（9）what we need are good doctors.
小結:（1)引導主語從句連詞有that,whether,who,what,whatever等（2)連詞位于句首不能省略（3)主語從句大多數情況下視為三單,但也有例外,如例9
第二部分：為了防止句子頭重腳輕，通常把形式主語it放在主語位置，真正主語擱置于句末
（1）it is certain that he will win the match.
（2）it is true that he has made a very important discovery in chemistry.
（3）it is very likely that they will hold a meeting.
（4）it is strange that he should do that.
（5）it is important that we all should attend the meeting.
（6）it is strange that the man should have stuck to his silly ideas.
（7）it is a pity that we won't be able to go to the south to spend our summer vacation.
（8）it is still a mystery what caused the accident.
（9）it is said that he has gone to shanghai.(=he is said to have gone to shanghai)
（10）it is known to all that the gun powder was first invented by the chinese.
（11）it is suggested that the work should be done with great care.
（12）it seems that he has seen the film.(=he seems to have seen the film)
（13）it happened that the two cheats were there. (=the two cheats happened to be there)
小結:（1)以that 引出的主語從句,常以形式主語it引導. it is +形容詞/名詞/某些動詞ed + that 從句.（2) 在有些that從句中要用虛擬語氣 (should+do/should+have done)例句4,5,6,11.
3、主語從句的用法
主語從句是在復合句中充當主語的從句，通常放在主句謂語動詞之前或由形式主語it代替，而本身放在句子末尾。
1. it 作形式主語和it引導強調句的比較
it 作形式主語代替主語從句，主要是為了平衡句子結構，主語從句的連接詞沒有變化。而it引導的強調句則是對句子某一部分進行強調，無論強調的是什么成分，都可用連詞that。被強調部分指人是也可用who/whom。例如： it is a pity that you didn’t go to see the film.
2. 用it 作形式主語的結構
 (1) it is ＋名詞＋從句
it is a fact that … 事實是…     it is an honor that …非常榮幸
it is common knowledge that …是常識
 (2) it is ＋形容詞＋從句
it is natural that… 很自然…         it is strange that… 奇怪的是…
 (3) it ＋不及物動詞＋從句
it seems that… 似乎…          it happened that… 碰巧…
 (4) it is＋過去分詞＋從句
it is reported that… 據報道…         it has been proved that… 已證實…