定語從句中的that
我們知道，定語從句由關係代詞和關係副詞引導。that就是其中一個特殊的關係代詞。that既指人又指物，在定語從句中，作為關係代詞有的時候可以和which和who互換。
但是一些特殊的情況只能用that。那麼我們來看一下這些特殊情況：
1、 當先行詞是不定代詞 all, much, little, something, everything, anything, nothing, none等時。
●You should hand in all that you have.
你應該上交你所有的東西。
●Do you have anything that you want to say for yourself ?
你有什麼要為自己說的嗎？
●Jim did everything that could improve her grades.
吉姆做所有可以提高成績的事。
2、 當先行詞被the only, the very, any, few, little, no, all等詞修飾時。
●Singing is the only thing that interests Alice most.
唱歌是唯一愛麗絲感興趣的事。
●This is the very person that Im waiting for.
這正是我要等的那個人。
●The only thing that we can do is to give you some advice.
我們唯一能做的就是給你一些建議。
3、 當先行詞是形容詞最高階或先行詞的前面有形容詞最高階修飾時。
●This is the best way that has been used against pollution.
這是應對汙染的最好方式。
●This is the most interesting film that I’ve ever seen.
這是我看過的最有趣的電影。
4、 當先行詞是序數詞或它前面有序數詞修飾時。
●This train is the last that will go to Suzhou.
這是去蘇州的最後一輛火車。
●What is the first American film that you have seen？
你看過的第一部美國電影是什麼？
5、 當先行詞既有人又有物時。
●Do you know the things and persons that they are talking about?
你知道他們在談論什麼人和什麼事情嗎？
6、 句子中已經有who或which時，避免重複。
●Who is the man that is making a speech?
正在演講的那個男人是誰。
以上就是定語從句中關於that的特殊用法。把這些規則牢記之後大家會發現好多坑題我們都是可以搞定的。定於從句的規則還有好多，想要把定語從句學透還是要反覆記憶並且多做練習的。希望小夥伴們可以把定於從句學透，巧做難題！
相關知識：定語從句中的that和which
很多同學可能都會覺得在使用定語從句的.時候，有時不知該選擇that還是which作為引導詞。其實只要記得以下幾點，並多做練習，在具體的句子中加以理解，一切問題就可以迎刃而解了。
首先，that和which在從句裡都可以做賓語和主語，做賓語時可以省略。
在定語從句中,有種說法叫"關賓省",意思是關係代詞在限制性定語從句中作賓語可以省略,不管是that，which，還是whom。但是which能引導非限制性定語從句，that則不行。
其次，記得以下只能用that的幾種情況：
1. 當先行詞為all, much, little, none及由any, every, some, no所構成的複合不定代詞時。
如：We should do all that is useful to the people. 我們應該做一切有益於人民的事情。
Please tell me anything that you know about the matter. 有關此事，凡是你所知道的請告訴我。
2. 當先行詞被any, few, little, no, all, much, some等詞修飾時。
如：You can take any seat that is free. 任何空著的座位你都可以坐。
There is little work that is fit for you. 幾乎沒有適合你的工作。
3. 當先行詞為序數詞或被序數詞所修飾時。
如：When people talk about the cities of China, the first that comes to my mind is Beijing. 人們談論起中國的城市的時候，我首先 想到的是北京。
This is the fourth film that has been shown in our school this term. 這是我們校本學期放映的第四部電影。
4. 當先行詞為形容詞最高階或被形容詞最高階修飾時。
如：The best that I could do was to apologize. 我唯一能做的就是賠禮道歉了。
This is the most interesting story book that I have ever read. 這是我讀過的一本最有趣的故事書。
5. 當先行詞被the very, the only, the last, the just, the same等修飾時。
如： This is the very book that I'm looking for. 這正是我在找的書。
The only thing that we could do was to wait. 我們唯一能做的事就是等待。
注意：先行詞被the same修飾時，關係代詞也可用as。
如：I need the same book that / as you have. 我需要有你一樣的書。
6. 當先行詞既包含人又包含物時。
如： They are talking of the heroines and their deeds that interest them. 他們正在談論他們感興趣的女英雄及她們的事蹟。
7. 當先行詞是疑問代詞who，which，what或主句以這些詞開頭時。
如：Who that has ever worked together with him doesn't admire him? 曾經和他一起工作過的誰不欽佩他？
Which is the star that is nearer to the earth？ 哪個是離地球比較近的星星？
8. 當先行詞為主句表語或關係代詞為從句表語時。
如：That's a good book that will help you a lot. 那是本對你很有幫助的書。
Our school is no longer the place that it used to be. 我們的學校現在已不是過去的那個樣子了。
9. 先行詞為time時，當time表示次數，引導詞用that, 可省略。 當表示時間，可用that或when引導，都可省略。
如：I do remember the first time(that) I had ever heard the sweetest voice in the world.我很清楚地記得當我第一次聽到世界上最美的聲音的時候。
I did't remember the exact time （when/that） I arrived in Shanghai last month. 我不記得上個月到達上海的確切時間了。
最後，請注意以下幾種只能使用which的情況:
1. 在“介詞＋關係代詞”結構中，關係代詞必須用which。
如： The house in which we live is very large. 我們住的房子非常大。
This is the reference book of which the teacher is speaking. 這就是老師正在談及的那本參考書。
注意： 如果介詞不放在修飾事物的限定性定語從句的句首， which就可換為that， 例如： This is the question which/that we've had so much discussion about. =This is the question about which we've had so much discussion. 這就是我們已經多次討論過的問題。
2. 先行詞為“those＋表事物的複數名詞”時， 關係代詞通常只用which而不用that。
如：you should grasp well those skills which may be used in the future work.
最後，記得這個特殊情況吧：當先行詞是表示原因或方式的名詞時，可以用that引導定語從句，相當於介詞+which，that可以省略。
如： She likes the child for the very reason that (=for which) she loves his father. 她喜歡那個孩子因為她愛著孩子的父親。
He didn't like the way that (=in which) she speaks to his mother. 他不喜歡她對他的母親那樣說話。
Imagine the speed that (=at which) he drives the car. 很難想象，他開車開得那麼快。
The reason (that /for which /why) he came here was to ask for our help.他來這裡的原因是尋求我們的幫助。
