表語從句和其他英語中的從句一樣，有很多不同含義和不同用法的引導(dǎo)詞，下面，小編就來為大家講解一下表語從句的引導(dǎo)詞：

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1.從屬連詞：that / whether /as if /as though/as/because

(1) that引導(dǎo)表語從句本身沒有詞義，在句中只起連接作用，不充當(dāng)句子成分，一般不能省略。

That fact is that more than seventy percent of the earth’s surface is covered by water.

連接詞that一般不能省略，但當(dāng)主句中含動(dòng)詞do的某種形式時(shí)，that可以省略。

What I want to do is (that) I can go up to him and thank him. 我想做的事是走到身邊去感謝他。

(2) whether引導(dǎo)表語從句表示“是否”,但不充當(dāng)句子的成分。

The question is whether we can finish our work by tomorrow evening.

if 與whether均意為“是否”，但引導(dǎo)表語從句時(shí)，只能用whether, 不能用if。

(3)as if/though“好像”，引導(dǎo)表語從句時(shí)要注意語態(tài).

如果句中的情況與事實(shí)不相符，從句多用虛擬語氣。如果從句表示與現(xiàn)在事實(shí)相反,謂語動(dòng)詞用一般過去式；如果從句表示與過去事實(shí)相反時(shí),謂語動(dòng)詞要用“had + 過去分詞”，如果從句表示將來的可能性不大，用would (might ,could )+動(dòng)詞原形.

Li Lei is now in a new jacket. He looks as if he were an American boy. (現(xiàn)在事實(shí)相反)

The girl is giving us a vivid description of the moon. It seems as if she had been to the moon many times. （與過去事實(shí)相反）

It looks as if it might rain. （與將來事實(shí)相反）

但是，如果as if/though引導(dǎo)的表語從句所表示的與事實(shí)相符，從句則用陳述語氣。

The clouds are gathering. It looks as if is going to rain.

(4) as引導(dǎo)表語從句

He looked just as he had looked ten years before.

他看起來還與十年前一樣。

(5) because引導(dǎo)表語從句

常用結(jié)構(gòu)：This/That/It is/was because····

That is because I don’t like Chinese.

2.連接代詞：who/whom/whose/what/which/whoever/whatever/whichever/whomever，在表語從句中做主語、賓語、表語和定語。

Tom is no longer what he used to be. (what做表語)

The problem is who is fit for this job. (who做主語)

This is what I want to tell you. (what做賓語)

The problem is whose work is the best. (whose做定語)

3.連接副詞：when/where/how/why，在表語從句中做狀語。

The question is how he did it.???????? 問題是他是如何做此事的。

The question is where we can live.???? 問題是我們能住在哪兒。

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以上就是表語從句的引導(dǎo)詞的所有分類和用法了，希望在今后的學(xué)習(xí)和生活中能幫到大家。喜歡就收藏吧~