which在从句中什么时候用
1)这些都是定语从句里面，由which引导的定语从句，介词提前。下面这些介词的使用除了意思上的区别，具体是要以which引导的从句而定的。
①in which可以翻译成在……里面
The school (that/which) he once studied in is very famous.
= The school in which he once studied is very famous.
②for which可以翻译成为了……目的
Tomorrow I will bring here a magazine (that/which) you asked for.
= Tomorrow I will bring here a magazine for which you asked.
③on which可以翻译成在……的上面，或具体时间的某一天
I have a dresser in my bedroom, which there are many cosmetics on.
= I have a dresser in my bedroom on which there are many cosmetics.
④at which可以翻译成在……里面或在……
The dumpling House which he often has dumplings at is very popular.
= The dumpling House is very popular, at which he often has dumplings.
2)当然第一点只是介词作为基本意思的用法，还有一些固定搭配，得具体情况具体分析。
①The plane may be several hours late, in which case there’s no point in our waiting.
(固定搭配：in the case)
②The speaker paused to examine his notes, at which point a loud crash was heard.
(固定搭配：at the point)
③Ten years of hard work changed her greatly, for which reason he could hardly recognize her at first sight.
(固定搭配：for the reason)
④The film at which I fell asleep was very boring.
(Here "at which" is based on "fell asleep at the film"因为电影无聊而睡觉。)
⑤The little creature in which scientists are interested is known as ET.
(这里"be interested in"是词组原因)
⑥This is the book for which he is looking.
(即等于This is the book which he is looking for，这主要是因为look for 这一短语)
关系副词与“介词+which”的区别
引导定语从句时where与in which有时可互换，有时不能互换，注意以下几点：
一、关系副词与“介词+which”互换的情形
当“介词+ which”在定语从句中作时间、地点和原因状语时，可以用相应的关系副词when, where和why来替换。
1. when根据情况可以等于in which, at which, on which等。如：
The day when (=on which) she arrived was Thursday. 她到的那天是星期四。
2. where根据情况可以等于in which, at which, on which等。如：
This is the hotel where ( =in which / at which) they were staying. 这就是他们当时住的旅店。
3. 关系副词若要换成“介词+which”只能是for which。如：
The reason why (=for which) I came here was to be with my family. 我到这里来的原因是要跟我的家里人在一起。
哪几种情况,定语从句的引导词只能用that
It is high time that they started out. 他们该动身了。5.当先行词是way等词时，关系代词用that或者in which在定语从句中作方式状语时，在口 语中，常可省略。例如：This is the way that my father did this work.这就是我父亲做此工作的方式。She admired the way in which I answered ...
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It is high time that.怎么用
It's high time + that 从句谓语动词有两种形式：动词的过去式(be用were)；或者用shoud + 动词原形（should不能省略)；句型是虚拟语气句型，意思“现在某人该做某事了”。例句：1、Therefore, it is high time that parents and schools should be alert to the problem and restrict children's ...
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如果我没记错的话，这个句式确实需要使用虚拟语气形式，其后的从句谓语有两种形式，也可以理解为固定句式：It is (high) time that +主语+谓语动词的过去式\/should do 表示“现在某人该做某事了”。含有该事早该去做而未做，现在去做似乎都为时已晚的意思。如：It's high time that we went to ...
It is high time that...怎么用
It's high time + that 从句谓语动词有两种形式：动词的过去式(be用were)；或者用shoud + 动词原形（should不能省略)；句型是虚拟语气句型，意思“现在某人该做某事了”。例句：1、Therefore, it is high time that parents and schools should be alert to the problem and restrict children's ...
虚拟语气在哪些从句中出现?
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III 从句中须用虚拟语气的情况 一、在wish的宾语从句中 1. 动词wish后跟由that引导的宾语从句(that经常被省略)要用虚拟语气表示一种不可实现的愿望。宾语从句中用过去时(be 用were的形式)表示与现在事实相反,用过去完成时表示与过去相反 She wishes she had more money. (她真希望有更多的钱。) \/ I wis...
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对，关系代词在从句中是代替先行词的，可以把先行词代入定语从句中，定语从句一般紧跟在先行词的后面，有时也可以和先行词分离。在白俄罗斯语中，定语从句也是由关系代词引导的，它的性和数一定要和先行词一致，但它的格取决于先行词在句中的语法地位。希望我能帮助你解疑释惑。
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潍坊市15672087544： 定语从句中什么时候用where,什么时候which - ？
虫卓汇新：[答案] which是关系代词,通常在限定性定语从句中充当主语、表语或是宾语. where是关系副词在修饰地点时才用.在从句中充当地点状语.第一,先找出定语从句,用括号括起来. 第二,看看括号里的句子缺不缺主语和宾语,缺的话就用which,不缺就用where.
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