as与which引导非限定性定语从句

1、as与which引导非限定性定语从句用法首先，as和which都可以表示主句在意义上的连贯，在从句中作主语，或用作及物动词的宾语，如： He married her， whichas was natural I was very useful to him， which as he realized 但下列情况下as和which一般不能互换： 1as既可以指前面提到过的事实或情况，因此as可以放在句首、句末，也可以插入主句中，而which指前面提到的事实或情况，一般放在主句之后（有时也可用as），如： As our teacher points out， that book is of ben

2、efit to everyone Heat is a form of energy， as is known to all of us This machine， as might be expected， has stopped operating 2as含有正如、按照、正像之意，as一般用在肯定句中，而which则 多用于含否定意义的句子中，如： He failed in the exam again， as was expected He failed in the exam again， which was unexpected 3当定语从句所修饰的主句内容是谓语动词的对象时，常用as

3、，如： Jack was admitted into the university， as we had expected 4下列固定结构，一般不能用which，如： as has been said before 如前所述 as often happens 正像经常发生的那样 as is well known 众所周知 as will be shown in Fig 3 将如图3所示 as we know 正如我们知道的那样 as may be imagined 这可以想象得出来 as we all can see 正如我们大家看到的那样 5当关系代词代表主句引起的结果，又做主谓宾补（svo

4、c）结构中的主语时，多用which，如： He saw the girl， which delighted him He didnt pass the exam， which made his mother angry 6在从句中作介词宾语时，用which，如： We didnt go to the film， instead of which we went to the theatre 7在从句中作定语时，常用which，如： I told her to see a doctor， which advice she took 8在从句中代表主句中的谓语的整个概念时，常用which，如： H

5、e can write a letter in English， which I can not 9指代主句中一个名词时，多用which，如： I gave him an interesting book， which he started to read at once 10代替主句中的形容词时，常用which，如： He thought me impatient， which he himself was 练习（判断正误） 1Her performance was wonderful， which we had expected 2He told us a joke， which made

6、 all of us laugh 3As is well known to us all that the earth is round 4Metal will bear beating with a hammer， as a stone will not 5He was emigrated（移居）in 1948，at which time there was much hardship and unrest 6Mum always treats me just like a baby， as I cant bear 7Lincoln was shot in a theatre， which was described in this book 8His children asked him to go for a row with them in the afternoon， which he promised 9This book， as is imagined， is very good 10Dorothy was always speaking highly of her rol