as和which引导定语从句的异同

I may have to work late, in which case I 我可能得晚点下班，那样我会给你打电话的。
’ ll telephone you.
The machine may be out of order, in which case it will be repaired at once.
He lifted so heavy a stone as no one else can lift.
He is so young a boy that he can
’ t go to school.
2.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。 As is known to all, China is a developing country. He is from the south, as we can see from his accent. John, as you know, is a famous writer. Li Ming is late, as is often the case.
which 或者 that 引导定语从句。 Such men as heard him were deeply moved. 听过他说话的人，都会深受感动。（ as 在定语从句中作 heard 的主语） I've never heard such stories as he tells. 我从未听过像他讲的这样的故事。（ as 在定语从句中作 tell 的宾语） He lifted so heavy a stone as no one else can lift. 他搬起别人都搬不起的大石头。（ as 在定语从句中 lift 的宾语）
Ten years of hard work changed her greatly, for which reason he could hardly recognize
her at first sight.
二、不同点： 1. 在限制性定语从句中， 当先行词被 the same, such ,as ,so修饰时，要用 as 代替 who ，whom ，
注意： ①在 the same as结构中， as 也可用 that 代替。但严格地说， the same as强调相同， the
same that 注重同一。
She wore the same dress as her younger sister wore.
她穿着跟她妹妹所穿的一样的衣裙。（ as 指的是与先行词相似的同类事物） She wore the same dress that she wore at Mary's wedding.
as 和 which 引导定语从句的区别
一、相同点：
两者引导非限制性定语从句时， 可指代主句中的部分或整个句子的内容， 语，宾语或表语，位于主句之后有时可互换。
在从句中做主
The meeting was put off, as /which was exactly what we wanted.
He was a doctor, as/which I knew from his manner. 注： which 代表整个句子，还可用于 in which case, at which point, on which occasion 等。
她穿着她在玛丽婚礼上穿过的同一条连衣裙。（
that 指的是与先行词同一事物）
②定语从句 such/as …as… 与结果状语从句 such/as … that …的区别： as 在所引导的定 语从句中作主语，宾语； that 在结果状语从句中不做成分 He has such a good laptop as I want to buy. He has such a good laptop that I want to buy one.
1. The owner of the cinema needed to make a lot of improvements and employ more people to
keep it running, ____meant spending tens of thousands of pounds.
(不出所料 )
as often happens
(正如经常发生的那样 )
as has been said before
(如上所述 )
as is mentioned above
(正如上面所提到的 )
as everybody/we can see
（正如大家 / 我们所看到的）
as is known to all=as we all know
A. who
B. that
C. as
D. which
2. Jim passed the driving test, ____surprised everybody in the office.
A. which
B. that
C. this
D. it
3. The road conditions there turned out be very good, ____was more than we could expect.
（众所周知）
4. 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。（即 as
引导的定语从句在意义上不是否定的。）
He married her, which was unexpected. 他和她结婚了，这是出乎意料的。 ( 不可用 as)
He failed in the experiment, which was unexpected.
He has been to Paris more than several times, which I don
’ t believe.Hale Waihona Puke Baidu
3. as 有 “正如 …… ，正像 ……”的意思，而 which 则没有。常用的句型有：
as is often the case
(这是常有的事 )
as was expected