英語語法之強調(diào)句與從句的比較

1. 強調(diào)句與主語從句的比較

強調(diào)句將句子中的it is / was …that同時省去，句子仍然成立；而主語從句將that與后面部分代替it，成立。如：

(1) It is Li Lei's brother that you met in the street yesterday. 你昨天在街上所見到的就是李蕾的兄弟。

本句若將It is 及 that同時省去為：You met Li Lei's brother in the street yesterday. 句子同樣成立，因此前面的句子是強調(diào)句型。

(2) It is exciting that we have succeeded in sending up Shenzhou V. 我們成功地發(fā)射了神舟五號這件事情真令人興奮。

本句若將It is 及 that同時省去為：We have succeeded exciting in sending up Shenzhou V. 顯然句子錯誤，因此，前面句子不是強調(diào)句型，而是主語從句。

2. 強調(diào)句與定語從句的比較

◎強調(diào)句中的It沒有實際意義，It be與that可同時被省略；而定語從句中的It是主語，It be與that不可同時省略；

◎強調(diào)句型中be的時態(tài)須跟后面句子的時態(tài)相一致；而定語從句中主句謂語動詞be的時態(tài)須由主句的時間確定；

◎強調(diào)句將句子中的that不能省略，并且即使前面的名詞是事物時，也不能將that換成which；而定語從句中的that作賓語時可被省略，并且當先行詞是事物時可用which代替。

◎當it be后面的時間、地點名詞作主語、賓語或表語時，引導詞可用that / which；而作其他成分時，引導詞須用when / which。如：

(1) It is an English book (that / which) I bought yesterday. 它是我昨天買的書。(本句是對What is that?問句的回答，that所引導的是定語從句，that可被省略)

It was the English book that I bought yesterday. 昨天我所賣的就是這本書。(本句相當于對I bought the English book yesterday中an English book進行強調(diào))

(2) It was a room where we used to have meetings. 它是我們過去常在開會的房子。(where 所引導的從句對前面的room進行說明，它是定語從句 www.yingyuyufa.com)

It was in the room that we used to have meetings. 過去我們開會就在這間房子里。(in the room是被強調(diào)的部分，本句是強調(diào)句型)

(3) It is a day when the people celebrate their victory. 這是人們慶祝他們的勝利的日子。 (when所引導的從句對a day進行說明，是定語從句)

It was on that day that people celebrated their victory. 就在那一天，人們慶祝了他們的勝利。(強調(diào)on October 1, 1949)

3．強調(diào)句與狀語從句的比較

◎狀語從句句首的It本身就是句子的主語；而強調(diào)句首的It不作任何成分也沒有實際意義。

◎狀語從句的連接副詞that及句子前面的It be不能去掉。

◎狀語從句的引導詞可以是when / where，而強調(diào)句型中的that不能用其他詞代替。如：

(1) It is such an interesting book that we all like it very much. 它是一本如此有趣的書，我們大家都非常喜歡。(結(jié)果狀語主從復合句)

It is such an interesting book that we all like very much. 我們大家都非常喜歡的就是一本如此有趣的書。(強調(diào)such an interesting book)

(比較：It is such an interesting book as we all like very much. 這就是我們大家都非常喜歡的如此有趣的書。定語從句)

(2) It was already morning when he woke up. 當他醒來時，已經(jīng)是早晨了。(時間主從復合句)

It was the next morning that he woke up. 就在第二天早晨他醒來了。(強調(diào)the next morning)