爱华网-----------------------------------------------------------
只能用that的情况：
<1>关系代词在定语从句中作表语，不管是人或物只能用that。
He is not the man that he was when I first sawhim.
【他现在不是我第一次见他时那样的。】
<2>当先行词即指物又指人时，多用that引导定语从句。
Look at the girl andthe dog that are crossing the street.
【瞧正在过马路的那个女孩和那只狗。】
<3>当先行词是有生命的动物或人时，宜使用that而不是which。
1.What's the name ofthe animals that jumps about?
【四处蹦跳的动物叫什么名字？】
2.Who isthe girl that talked to you yesterday?
【昨天和你说话的女孩儿是谁？】
<4>当先行词被形容词的最高级修饰时引导定语从句的关系代词只能用that，而不能用which。
This is themost interesting bookthat I've ever read.
【这是我所读过的最有趣的书。】
<5>当先行词被all,something,anything,nothing,everything,little,much,theone,none等时，引导定语从句多用关系代词that。
1.The goverment has promisedto do all that lies in its power to alleviate thehardships of people.
【政府承诺尽其一切力量减轻人民的苦难。】
2.When wesee anything that happen on the island, we're soglad.
【当我们看到岛上发生的事情，我们都如此兴奋。】
3.Tom told hisfather all that had happened.
【汤姆把事情发生的全部情况都告诉了他的父亲。】
4.Pay attention to everythingthat I do.
【注意我做的每一件事。】
5.The teacher wants to teachus all thathe knows.
【老师想把他知道的全部知识都交给我们。】
6.You mustdo everythingthat I do.
【我做的每件事你必须都做。】
<6>当先行词被theonly, the very, the first,the last,few,little,no,all,one of,thesame等修饰时，须用关系代词that来引导。
The onlything that we can do is to give you somemoney.
【我们唯一能够做的就是给你一些钱。】
<7>当主句中已有疑问词who或which时，要用关系代词that。
Which isthe bik e thatyou lost?
【你丢失的自行车是哪辆？】
只能用which的情况：
<8>在介词后面的关系代词用which而不能用that。即“介词+which（代物）”
1.Thepicture for which he paid $1,000 was once owned by aduke.
【他花了1000美元买下的画曾为一名公爵所拥有。】
2.Thebuilding in which Han Mei studied was very old.
【韩梅在里边学习的那幢大楼很旧。】
<9>在非限定性定语从句中不能用that。
Crusoe's dog, which was very old now, became ill anddied.
【克鲁索的狗，现在已经很老了，病死了。】
<10>有两个定语从句，其中一个关系代词已有which,另一个宜用that。相反，如果其中一个为that，另一个宜用which。
1.Edison built up afactory which producedthings
thathad never been seen before.
【爱迪生办了一个工厂，生产过去从未见过的东西。】
2.Let me show you thenovel that I borrowed fromthe library which was newly open to us.
【让我给你看看我从新开放的图书馆借来的小说。】
共同点：
<11>当定语从句所修饰的先行词为物时，关系代词可用which或that。
1.In fact the Swede did notunderstand the three questions that/which were asked in English.
【事实上Swede并不理解三个被提问到的英语问题。】
2.Colourthe birds which/that are flying.
【给那些正在飞着的鸟上色。】
3.Thepenthat/which I am using is quiet good.
【我正在使用的那支钢笔相当好。】
4.Thefilm which/that we saw last night waswonderful!
【昨晚我们看的那部影片真棒！】
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定语从句
１.先行词为人：
１）人做主语－－－关系代词用who且不可省略
２）人做宾语－－－关系代词用whom／who/不填
２.先行词为物：
１）物做主语－－－关系代词用that/which
２）物做宾语－－－关系代词用that/which/不填
注意事项：
１.定语从句中，用that不用which的情况:
1)先行词为不定代词 something anyting everytingnothing
2)先行词由序数词修饰：
This is my first /last lesson that cant be forgotten.
3)先行词由最高级修饰时：
The most important thing that should be done is to study.
4)先行词由all few ，every， little， much， many， only，any， some， very（恰恰）修饰时
This is the very book that is sold well. The only thing that youcan do is to wait.
5)先行词既有人又有物时
They talked about things and persons that they couldremember.
6)由which,who提问的句子，为了避免重复
which of the books that you need is the best?
7)先行词为人或物，但在定语从句中做表语
he isnt the man that he was.(他不是以前那个他了)
２.用which不用that的情况
Ｉremember the day on which i joined the army.
即介词提到先行词后面，关系代词前面时，只能用which
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