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2. that 與 which的用法區(qū)別。兩者都可指物，常可互換。其區(qū)別主要在于：

(1) 引導(dǎo)非限制性定語(yǔ)從句時(shí)，通常要用which：

She received an invitation from her boss, which came as a surprise. 她收到了老板的邀請(qǐng)，這是她意想不到的。

(2) 直接放在介詞后作賓語(yǔ)時(shí)，通常要用which：

The tool with which he is working is called a hammer. 他干活用的那個(gè)工具叫做錘子。

(3) 當(dāng)先行詞是下列不定代詞或被它們修飾時(shí)much, little, none, all, few, every(thing), any(thing), no(thing) 等時(shí)，通常用that：

There was little that the enemy could do but surrender. 敵人無(wú)法,只有投降了。

All [Everything] that can be done must be done.  凡能做的事都必須做。

(4) 當(dāng)先行詞有the very, the only, the same 等修飾時(shí)，通常用that：

This is the only example that I know. 我知道的例子只有這一個(gè)。

Those are the very words that he used. 那是他的原話。

(5) 當(dāng)先行詞有形容詞最高級(jí)或序數(shù)詞(包括last, next等)等修飾時(shí)，通常用that：

This is the best dictionary that I've ever used. 這是我用過(guò)的最好的詞典。

The first thing that you should do is to work out a plan. 你應(yīng)該做的第一件事是訂個(gè)計(jì)劃。

(6) 當(dāng)關(guān)系代詞在定語(yǔ)從句中用作表語(yǔ)時(shí)，通常用that：

China is not the country (that) it was. 中國(guó)已不是過(guò)去的中國(guó)了。

(7) 當(dāng)先行詞是一個(gè)既指人又指物的并列詞組時(shí)，通常用that：

They talked about the persons and things that most impressed them. 他們談?wù)摿耸顾麄冇∠笞钌畹娜撕褪隆?/SPAN>

(8) 當(dāng)要避免重復(fù)時(shí)：

Which is the course that we are to take? 我們選哪門(mén)課程？

3. that與who的用法區(qū)別。

(1) 兩者均可指人，有時(shí)可互換：

All that [who] heard him were delighted. 所有聽(tīng)了他講話的人都很高興。

Have you met anybody that [who] has been to Paris? 你遇見(jiàn)過(guò)到過(guò)巴黎的人嗎?

He is the only one among us that [who] knows Russian.他是我們中間唯一懂俄語(yǔ)的人。

(2) 但是在下列情況，通常要用 that：

①當(dāng)先行詞是一個(gè)既指人又指物的并列詞組時(shí)：

I made a speech on the men and things that I had seen abroad. 我就我在國(guó)外所見(jiàn)到的人和事作了報(bào)告。

②當(dāng)先行詞是who時(shí)(為避免重復(fù))：

Who was it that won the World Cup in 1982? 誰(shuí)贏得了1982年的世界杯？

③當(dāng)關(guān)系代詞在定語(yǔ)從句中作表語(yǔ)時(shí)(可省略)：

Tom is not the boy (that) he was. 湯姆這孩子已不是以前那個(gè)樣子了。

4. as與which的用法區(qū)別

(1) 引導(dǎo)限制性定語(yǔ)從句時(shí)，在such, as, the same后只能用as，其他情況用 which：

I never heard such stories as he tells. 我從未聽(tīng)過(guò)他講那樣的故事。

It's the same story as I heard yesterday. 這故事跟我昨天聽(tīng)到的一樣。

This is the photo which shows my house. 這張照片拍的是我的住宅。

(2) 引導(dǎo)非限制性定語(yǔ)從句時(shí)，有時(shí)兩者可互換：

I live a long way from work, as [which] you know. 我住得離工作單位很遠(yuǎn)，這你是知道的。

(3) 但在，在以下情況引導(dǎo)非限制性定語(yǔ)從句時(shí)，兩者不可換用：

① 當(dāng)從句位于主句前面時(shí)，只用 as：

As is known to everybody, the moon travels round the earth once every month. 月球每月繞地球轉(zhuǎn)一周，這是每個(gè)人都清楚的。

② as 引導(dǎo)的非限制性定語(yǔ)從句應(yīng)與主句在意義上和諧一致，which無(wú)此限制：

He went abroad, as [which] was expected. 他出國(guó)了，這是大家預(yù)料到的。

He went abroad, which was unexpected. 他出國(guó)了，這讓大家感到很意外。(不用as)

③ as 引導(dǎo)非限制性定語(yǔ)從句時(shí)，先行詞通常不能是主句中某個(gè)具體的詞，而應(yīng)是整個(gè)句子、整個(gè)短語(yǔ)或某個(gè)短語(yǔ)推斷出來(lái)的概念，而which 則無(wú)此限制：

The river, which flows through London, is called the Thames. 這條流經(jīng)倫敦的河叫泰晤士河。(不用as)

④ 當(dāng)as 引導(dǎo)非限制性定語(yǔ)從句作主語(yǔ)時(shí)，其謂語(yǔ)通常應(yīng)是連系動(dòng)詞，而不宜是其他動(dòng)詞，而 which則無(wú)此限制：

She has married again, as [which] seemed natural. 她又結(jié)婚了，這似乎很自常。

She has married again, which delighted us. 她又結(jié)婚了，這使我們很高興。(不用as)

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