(3)先行词为only，very等词修饰肘。
例：①It was the only textbook that could be found．这是能够找到的仅有的一本课本。
②This is the very dictionary that I want to get．这正是我想得到的词典。
(4)定语从句中固定短语动词和短语中的介词不能前置。
例：It was the maths book that the boy was in search of．这是这个男孩正在寻找的数学书。
5)whose与of which/whom
(1)都可表所有关系。
(2)of which/whom还可表示"其中的……"(整体的部分)
例：He told us many stories about Long March，of which this is a good example.他给我们讲了许多关于长征的故事，这是其中一个很好的例子。
as和which引导的非限制性定语从句比较:
下面是近年高考题中关于定语从句的试题
1.The result of the experiment was very good, ____ we hadn't expected． (NMET20xx，10)
2.Dorothy was always speaking highly of her role in the play，____,of course，made the others unhappy.
(NMET20xx，17)
A.when B.which C.this D.what
3．Carol said the work would be done by October,____ personally I doubt very much．(NMET99，19)
A.it B.that C.then D.which
4.The weather turned out to be very good,____ was more than we could expect. (NMET94,39)
A.what B.which C.that D.it
它们的答案分别是C、B、D和B，都是用which引导一个非限制性定语从句，which代替逗号前整个主句的内容。
但有时关系代词as也可引导非限制性定语从句，as也是代替整个主句的意思。如:
As we all know，he never smokes. The foolish boy made the mistake again，as could be expected. ____ is mentioned above，the number of students in senior high school is increasing．('99上海，4)
A.Which B.As C.That D.It
关系代词as和which引导的非限制性定语从句区别究竟在哪里呢?
1．非限制性定语从句位于句末，而且as或which在从句中作主语、宾语或表语时可互换。如:
He is a farmer as/which is clear from his manners．(在从句中作主语)
This elephant is like a snake，as／which anybody can see．(在从句中作宾语)
2. which引导的非限制性定语从句一般放在句末，而as引导的非限制性定语从句可放在句末，也可放在句中、句首。置于句首时，不能用which替换。如：
Crusoe lost his dog, which made him very sad.
Taiwan is part of China, as/which is known to all.
As we have seen, oceans cover more than 70 percent of the earth.
3.as引导非限制性定语从句时，意为"这一点"、"这件事"，常与see，hope，expect，know，guess等动词搭配；而which引导非限制性定语从句时，与主句有一种因果关系，可译为"所以……"。如：
Cyprus, as you all know, is in the Mediterranean．大家都知道，塞浦路斯在地中海。
Bamboo is hollow，which makes it very light。竹子是空的，所以很轻。
4.as引导非限制性定语从句，并在从句中作主语时，其后面的谓语动词必须是连系动词。如果从句谓语动词是行为动词，则必须用which。如：
He married her，as was natural.
She refused to take the medicine，which made her mother angry．
It rained hard yesterday，which prevented her from going to Shenyang.
但若从句谓语是usually, happen，be often the case等时，仍用关系代词as，不用which。如：
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unit1 Madame Curie教学目标