as和which引导非限制性定语从句的区别 知识点
as与which引导非限制性定语从句的区别：
这类定语从句只能由 which 或 as 引导。两者之间的区别在于：
1. which 引导的定语从句只能位于主句后，但as引导的从句可位于主句前、中、后。
例如：①David, as you know, is a photograopher. 戴维是个摄影师，你是知道的。(不可用which)；
②Li Ming is late, as is often the case. 李明迟到了，这事是经常发生的。(不可用which)。
2. as在定语从句中作主语时，从句谓语通常要有be或别的系动词，但which不受此限制。
例如：Li Ming was late, which (=and this) made Mr. Zhang very angry. 李明迟到了，这件事使张先生非常生气。(不可用as)
3. as 引导的定语从句只表示一个众所周知或意料之中的事，但 which 不受此限制。
例如：He married her, which was unexpected. 他和她结婚了，这是出乎意料的。(不可用as)
4. as有“正如”之意，而which则意为“这(件事，一点)”，可用and this/that/it来代替。
5. as多用于固定搭配中：as is often the case(这是常有的事)，as was expected(不出所料)，as often happens(正如经常发生的那样)，as is known to all(众所周知)，as has been said before(如上所述)，as is mentioned above(正如上面所提到的)等。
注意：which 代表整个句子，还可用于in which case, at which point, on which occasion等。例如：I may have to work late, in which case I’ll telephone you. 我可能得晚点下班，那样我会给你打电话的。
as和which引导非限制性定语从句的区别 知识点题库
My grandfather is fond of talking about the good old days, ___ is often the case with old people.
A . which
B . when
C . as
D . it
was reported in the paper, no people died in the accident.
A lot of language learning, has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.
A . as
B . it
C . which
D . this
There is no simple answer, _____ is often the case in science.
A . as
B . that
C . when
D . where
Creating an atmosphere ________ employees feel part of a team is a big challenge.
A . as
B . whose
C . in which
D . at which
—Hello, is Mr. Smith in?
—Sorry, there is ______person ______ you referred to in my office.
A . such no; that
B . such no; whom
C . no such; who
D . no such; as
The sun heats the earth, makes it possible for plants to grow.
There is a net bar around here, I remember.
Due to the rising rents, the new graduate has decided to leave Beijing for his hometown, have many other classmates.
A . so
B . as
C . which
D . nor
is shown in the story, she is very clever.
There is no
simple answer, is often the case in science.
________ is mentioned above, the number of the students in senior school is increasing.
A . Which
B . As
C . That
D . It
__________ is known to us, the PRC was founded on October 1, 1949.
A . It
B . As
C . That
D . What
He is late, is often the
case. (as /which)
________ is known to all, friendship plays a very important part in our social life.
A . What
B . That
C . As
D . It
_______ is worldwide shown, great activities were held on the evening of Oct 1st to celebrate our motherland's 70th anniversary.
A . As
B . It
C . What
D . Which
________ is often the case with children, Tom was better by the time the doctor arrived.
A . It
B . That
C . What
D . As
Just a famous saying goes,
every coin has two sides.
is often the case with old
people, my grandfather is fond of talking about good old days. （用适当的词填空）
I hope all the measures against air pollution, suggested by the local government, will be seriously considered here.
A . as
B . which
C . that
D . while
