主語從句的位置情況及用it作形式主語的結(jié)構(gòu)
主語從句有個特殊的用法,即it可作形式主語,一般用在主語較復雜的情況下,另外,主語從句在幾種情況下不可以放在句首,下面,小編將給大家一一講解相關(guān)的語法知識,一起來看看吧!
用it 作形式主語的結(jié)構(gòu)
(1) It is +名詞+that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+that從句
It is natural that… 很自然……
It is strange that… 奇怪的是……
(3) it +不及物動詞+that從句
It seems that… 似乎……
It happened that… 碰巧……
(4) it is+過去分詞+that從句
It is reported that… 據(jù)報道……
It has been proved that… 已證實……
主語從句不可位于句首的五種情況
(1) if引導的主語從句不可居于復合句句首。
(2) It is said , (reported) …結(jié)構(gòu)中的主語從句不可提前。例如:
It is said that President Jingo will visit our school next week.
(3) It happens…, It occurs… 結(jié)構(gòu)中的主語從句不可提前。例如:
It occurred to him that he failed in the examination.
(4) It doesn’t matter how/whether …結(jié)構(gòu)中的主語從句不可提前。例如:
It doesn’t matter whether he is wrong or not..
(5) 含主語從句的復合句是疑問句時,主語從句不可提前。例如:
Is it likely that it will rain in the evening?
這五種情況,大家在今后的學習中要時刻注意,多思考才能不犯同樣的錯誤。趕快收藏起來吧~