定语从句在什么情况下可以省略关系词
定语从句（也称关系从句、形容词性从句），是指一类由关系词引导的从句，因为这类从句的句法功能多是做定语，以下是店铺精心整理的定语从句在什么情况下可以省略关系词，希望对大家有所帮助。
语从句在什么情况下可以省略关系词
关系词有时可以省略，但这只限于限制性定语从句中，在非限制性定语从句中，关系词则不可省略。关系词的省略主要限于以下几个方面。如：
Is there anything (which) you wanted? 想要什么东西吗?
Who is the man (that / who / whom) you were talking to? 刚才和你讲话的人是谁?
2. 关系代词作表语时的省略。当关系代词that在定语从句中用作表语时，可以省略。如：
China is not the country (that) it was. 中国已不是过去的中国了。(that作表语)
3. 关系代词作宾补时的省略。当关系代词that在定语从句中用作宾语补足时，可以省略。如：
I’m not the madman (that) you thought me. 我并不是你所认为的那个疯子。(that作宾语补语)
4. 关系代词作主语时的省略。一般说来，关系代词作主语时是不能省略的，但是在以下两种特殊情况，也可省略：
(1) 当定语从句为there be 结构时，作主语的that可以省略。如：
I’ve told you all (that) there is to tell. 该告诉的我都告诉你了。
(2) 当主句为there be结构时，在定语从句中作主语的that, which, who有时可省略。如：
There’s a gentleman (who) wants to see you. 有一位先生要见您。
(3) 当主句为it is, here is结构时，在定语从句中作主语的that有时可省略。如：
Here’s a little book (that) will tell you how to raise roses. 这是一本关于玫瑰花栽培的小册子。
5. 关系副词when的省略。用作时间状语的关系副词when通常不能省略，但有一种特殊情况，即用于day, year, time等少数几个词后时可以省略(也可换成that)。如：
That was the year (that) I first went abroad. 就是那一年我第一次出国了。
I’ll never forget the day (that) we met. 我永远也忘不了我们见面的那一天。
6. 关系副词where的'省略。用作地点状语的关系副词where通常不能省略，但有一种特殊情况，即用于place, somewhere, anywhere, everywhere, nowhere少数几个词后时可以省略(也可换成that)。如：
This is the place (where) they met yesterday. 这就是他们昨天碰头的地方。
Have you somewhere (that) I can lie down for an hour? 你有没有一个什么地方可以让我躺
一个小时？
7. 关系副词why的省略。关系副词why通常只用于the reason后引导定语从句，且通常可换成that或for which，均可省略。如：
That’s the reason (why, for which, that) he came. 这就是他来的原因。
定语从句关系词什么时候省略
1.关系代词which,whom,who,that在定语从句中作宾语时可以省略。
Here is the man (who/that/whom)you're been looking for.
以下情况不能省略：
（1）在介词+whom与介词+which中，whom,which不能省略。
Do you know any shops nearby in which I can buy flowers?
That is the headmaster with whom my father was talking just now.
注：当介词放在动词后时，which,whom就可以省略。
Who is the man (whom) you talked with just now?
（2）在非限制性定语从句中，作宾语的关系代词也不能省略。
Mr Green,whom you know,is the tallest in our school.
The elephant is like a spear,as anybody can see.
（3）在the same ...as,hat中，as,that即使作宾语，也不能省略I have bought the same bicycle as you have (bought). (指同类用as)
This is the same book that I read the day before yesterday. (that指同一个)
（4）当由and,but,or等连词连接两个或两个以上的定语从句修饰一个先行词时，第一个关系代词可省，但第二，第三个不可省略。
This is the book (which) I read yesterday and which I find very interesting.
2.当that在从句中作补语时可以省略。
He is not the man (that) he used to be.
She is all (that) a teacher should be.
3.在there be 结构中出现定语从句，或在定语从句中出现there be 时，用作主语的关系代词也可省略。
There is a man downstairs (who) wants to see you.
This is the best dictionary (that) there is in the library.
4.状语的省略
（1）当先行词是reason，而且定语从句中作原因状语时，关系代词可用why,that,也可以省略。
The reason (why/that) he failed was his laziness.
That is the reason (why) I did it.
（2）当先行词是way,且在定语从句中作方式状语时，关系代词可用in which,that,也可以省略。
The way (in which/that) these comrades look at problems is wrong.
That was the way (in which/that) she worked the problem out.
注意：当关系代词在定语从句中作主语时，不省略。
例如：I don't know the way that/ which leads to the top of the mountains.
限制性从句(3)当先行词是time时，关系代词可用when,that 或省略。
The second time (that) I saw him was in 1980.
I don't know the exact time (when/that) the sports meet will take place.
注意：关系代词作宾语有时也不能省略。
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