主語從句如何使用
主語從句即在複合句中充當主語成分的句子,那麼你對主語從句的使用方法瞭解多少呢?以下是由小編整理關於主語從句的用法的內容,希望大家喜歡!
主語從句的用法
主語從句 定義:在句子中擔當主語的是一個從句,這個從句就叫做主語從句。
主語從句是在複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
①主語從句常用it作形式主語,一般常用句型為:It is+{名詞/形容詞/過去分詞}+主語從句例如:
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外,還有一些比較多見的結構:
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而強調句則不同,它的結構是:It+be+被強調部分+that+從句
強調主語:It is the times that produce their heroes.時勢造英雄
強調賓語:It is English that Prof.Lin teaches us.
強調狀語:It was in shanghai that I saw the film.
判斷是否是強調句有一個方法,就是將that以後的“句子的其餘部分”拿出來單獨看,看有沒有缺成分,缺的是什麼成分,再把謂語動詞後面that前面的那部分,帶到你認為缺成分的地方,如果放進去是一句完整的句子了,那就說明是強調句。
2. 用it 作形式主語的結構
***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… 據報道……
It has been proved that… 已證實……
3.主語從句不可位於句首的五種情況
***1*** if引導的主語從句不可居於複合句句首。
***2*** It is said , ***reported*** …結構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… 結構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 …結構中的主語從句不可提前。例如:
It doesn’t matter whether he is wrong or not..
***5*** 含主語從句的複合句是疑問句時,主語從句不可提前。例如:
Is it likely that it will rain in the evening?
4. What 與that 在引導主語從句時的區別
What 引導主語從句時在從句中充當句子成分,如主語.賓語.表語,而that 則不然。例如:
What you said yesterday is right.
中藥芒硝的用法中藥芒硝有什麼禁忌