例如:
When he was born is unknown. What he did last night is being investigated.
That many hands make light work is a well-known saying. 主语从句中应注意: 1.
主语从句一般用it作形式主语,放在句首,而将主语从句放到句末. 例如:
It is possible that he has stolen the car.
Isn't it strange that he should not have passed the test 附:考研中常见的主语从句句型(作文中也经常用到): 1)It +过去分词+that从句 It's reported that …据报道…… It's believed that…人们相信…… 2)It is +形容词+that从句
It is clear(显然……)/possible or likely(很可能……)/natural(很自然……) 3)It is +名词短语 +that从句 It is a pity that...可惜的是…… It is a fact that...事实是…… 4)It +不及物动词+that从句
It seems(似乎……)/follows(因此……,由此可见……)/happens(碰巧……) 5)其他重要结构
It dawns upon/on sb. that…某人突然想起…… It occurs to sb. that…某人突然想起…… It makes no difference that………无所谓
It doesn't need to be bothered that…不必担忧…… It is of little consequence that………无关紧要 2.
if引导主语从句时,只能用it作形式主语,放在句首,而将if引导的主语从句放到句末. 例如:
It is uncertain if he will leave for Beijing tomorrow. 3.
that引导主语从句放在句首时,that不可省,但在句末口语中可省. 例如:
That the seas are being overfished has been known for years.(2006) That he was ill yesterday is known now. 4.
连词whether以及连接代词或连接副词引导主语从句只能放在句首. 例如:
Whether the eyes are \window of the soul\is debatable; that they are intensely important in interpersonal communication is a fact.
Who has broken the glass is unknown. What he wants is all here.
How well the predictions will be validated by later performance depends upon the amount, reliability, and appropriateness of the information used and on the skill and wisdom with which it is interpreted. 5.
主语从句中主句的谓语动词一般用第三人称单数形式,但what引导主语从句的主句谓语动词的形式须根据句子的意思来判断. 例如:
How he worked it out is still a secret. What they make in this factory are TV sets. 二)表语从句
在主句中担