1、如果关系代词指代的是表示方式的先行词，那么in which可以用that取代。
2、当关系代词指代的是表示原因的先行词时，in which可以用that取代。
一、in which
读音：英 [ɪn wɪtʃ] 美 [ɪn wɪtʃ]
释义：在其中。
语法：which用作关系代词，可引导限制性定语从句或非限制性定语从句，引导非限制性定语从句时which可以用整个主句作为其前行词。
二、that
读音：英 [ðæt , ðət] 美 [ðæt , ðət]
释义：用于某些动词、形容词和名词后，引出从句。
语法：that用作指示代词的意思是“那，那个”。可指前面提到的那件事，也可指在空间或时间上较另一事物远的事物或人，还可指要表明的或要提及的事物、想法等。
扩展资料
that的反义词：this
this
读音：英 [ðɪs] 美 [ðɪs]
释义：(介绍人或展示事物时用)这，这样。
语法：this用作代词可用以指叙述中的人或事物，即指前面提到过的人或事物或下文提及的事物，this一般作主语时才指人，在电话用语中，this用来指代自己。
例句：
We've stopped transporting weapons to this country by train.
我们已停止用火车向该国运送武器。
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第1个回答 推荐于2017-11-22
一、你提到的问题比较笼统,猜想你是想知道什么情况下 in which 或 for which 可以用 that 代替吧.
如果关系代词指代的是表示方式的先行词（如way、manner、measure 等）,那么 in which 既可以用 that 也可以用 how 取代,还可以省略不用.如：
He wants to have his own way (in which) he can do whatever he likes.（希望有自己为所欲为的方式.）
He wants to have his own way (that) he can do whatever he likes.
He wants to have his own way (how) he can do whatever he likes.
He wants to have his own way he can do whatever he likes.
This is the best measure (in which) you can find out the thief.（这就是你抓住那个贼的最好手段.）
This is the best measure (that) you can find out the thief.
This is the best measure (how) you can find out the thief.
This is the best measure you can find out the thief.
同理.当关系代词指代的是表示原因的先行词（如 cause、reason、matter 等）时,in which 既可以用 that 也可以用 why 取代,当然也可以说省略不用.如：
The cause (in which) we support them is unquestionable.（我们援助他们的理由是不容置疑的）.
The cause (that) we support them is unquestionable.
The cause (why) we support them is unquestionable.
The cause we support them is unquestionable.
二、“介词 + 关系代词” 关系代词是 which,指代的是事物,关系代词是 whom（不能用主格 who） 指代的是人.
三、“介词 + 关系代词” 也可以把介词后置,如：
This is the house (in which) I used to live./This is the house (which) I used to live (in).这是我曾经住过的房子
The man (whith whom) I once worked is one of my friends./ The man (whom/who) I once worked (with) is one of my friends.我曾经共事的那个人是我的一个朋友.【介词后置,可以用主格 who 代替 whom】本回答被网友采纳
如果关系代词指代的是表示方式的先行词（如way、manner、measure 等）,那么 in which 既可以用 that 也可以用 how 取代,还可以省略不用.如：
He wants to have his own way (in which) he can do whatever he likes.（希望有自己为所欲为的方式.）
He wants to have his own way (that) he can do whatever he likes.
He wants to have his own way (how) he can do whatever he likes.
He wants to have his own way he can do whatever he likes.
This is the best measure (in which) you can find out the thief.（这就是你抓住那个贼的最好手段.）
This is the best measure (that) you can find out the thief.
This is the best measure (how) you can find out the thief.
This is the best measure you can find out the thief.
同理.当关系代词指代的是表示原因的先行词（如 cause、reason、matter 等）时,in which 既可以用 that 也可以用 why 取代,当然也可以说省略不用.如：
The cause (in which) we support them is unquestionable.（我们援助他们的理由是不容置疑的）.
The cause (that) we support them is unquestionable.
The cause (why) we support them is unquestionable.
The cause we support them is unquestionable.
二、“介词 + 关系代词” 关系代词是 which,指代的是事物,关系代词是 whom（不能用主格 who） 指代的是人.
三、“介词 + 关系代词” 也可以把介词后置,如：
This is the house (in which) I used to live./This is the house (which) I used to live (in).这是我曾经住过的房子
The man (whith whom) I once worked is one of my friends./ The man (whom/who) I once worked (with) is one of my friends.我曾经共事的那个人是我的一个朋友.【介词后置,可以用主格 who 代替 whom】本回答被网友采纳
第2个回答 2016-02-08
您好：
in which在后面的从句里充当状语，而that是名词，只能充当主，宾，表，所以如果后面的句子缺名词就用that，缺副词就用in which
另注：其实in which就是后面从句的in提前，如果个别动词不能和in搭配就要换成别的介词，比如：
I like the boy which I am looking at.=I like the boy at which I am looking.
我喜欢那个我看着的男孩。
如果对你有帮助，请采纳！祝你学习更上一层楼，数学辅导团为你解决疑问！
in which在后面的从句里充当状语，而that是名词，只能充当主，宾，表，所以如果后面的句子缺名词就用that，缺副词就用in which
另注：其实in which就是后面从句的in提前，如果个别动词不能和in搭配就要换成别的介词，比如：
I like the boy which I am looking at.=I like the boy at which I am looking.
我喜欢那个我看着的男孩。
如果对你有帮助，请采纳！祝你学习更上一层楼，数学辅导团为你解决疑问！
第3个回答 2016-12-28
he had loved for 20 years got married yesterday.
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