定语从句中什么时候that,who,which...可以省略？请举例说明！

在定语从句中，who，which什么时候可以省略~

who不能省略，但是作宾语时whom可以省略，如
He is the man （whom） I saw yesterday. 他就是我昨天见到的那个人。
which在定语从句中作宾语时可省略，如
The package (which) you are carrying is about to come unwrapped.你拿那个包裹快要散开了。
但是当which位于介词后面时则不能省略，如
I still remember the day on which I first came to school. 我仍然记得初来学校的那一天。

关键是要看先行词和从句的关系
第一句先行词supermarket,从句是i bought this kind of tin,肯定是在超市买的东西，说明先行词是从句的发生地点，就用where
第二句先行词是days,从句是we spent together on the island,spend这个动词缺少宾语，再联系意思，肯定是我们在岛上度过了一些日子。也就是说，第二类例子中单纯把从句拿出来看是不完整的，这个时候就填which或that
我就是这样辨别两者的



比如说这两题：
(1)This was the supermarket _____ I bought this kind of tin.(填where)
(2)We often think of the days _____ we spent together on the island.(填which)
我知道做题时首先要判断那个词是及物动词还是不及物动词。
如果是及物动词则表明从句缺宾语，就用which或that，如动词是不及物则说明从句不缺宾语，可能是状语(或介宾），就用where.
但是我就是不会判断那个动词是及物动词还是不及物动词，这怎么办？
比如说上面第一题，我们在用buy的时候，都没有说buy in sth.或者buy加介词吧？那为什么buy在那里又成了不及物动词(vi)了呢？
又如第二题，我们平时也有说spend in,spend on,那为什么spend却是及物动词(vt.)呢？

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,such...as,as...as,the same...that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.

(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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