as, which 非限定性定语从句
由as, which 引导的非限定性定语从句,as和which可代整个主句,相当于and this或and that.As一般放在句首,which在句中。
As we know, smoking is harmful to ones health.
The sun heats the earth, which is very important to us.
典型例题
1)Alice received an invitation from her boss, ___came as a surprise.
A. it B. that C. which D. he
答案C. 此为非限定性从句,不能用 that修饰,而用which.,it 和he 都使后句成为句子,两个独立的句子不能单以逗号连接。况且选he句意不通。
2)The weather turned out to be very good, ___ was more than we could expect.
A. what B. which C. that D. it
答案B.which可代替句子,用于非限定性定语从句,而what不可。That 不能用于非限定性定语从句,it不为连词,使由逗号连接的两个句子并在一起在英语语法上行不通。
3)It rained hard yesterday, ____ prevented me from going to the park
A. that B. which C. as D. it
答案B.
as 和which在引导非限制性定语从句时,这两个关系代词都指主句所表达的整个意思,且在定语从句中都可以作主语和宾语。但不同之处主要有两点:
(1) as 引导的定语从句可置于句首,而which不可。
(2) as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词;若为行为动词,则从句中的关系代词只能用which
在本题中,prevent由于是行为动词,所以正确选项应为B.
As 的用法
例1. the same as;suchas 中的as 是一种固定结构, 和一样。
I have got into the same trouble as he (has).
例2. as可引导非限制性从句,常带有正如.
As we know, smoking is harmful to ones health.
As is know, smoking is harmful to ones health.
As是关系代词。例1中的as作know的宾语;例2中,它充当从句的主语,谓语动词know要用被动式。
上一篇: 特殊的虚拟语气词:should
下一篇: 一般将来时
体坛英语资讯:Bilbaos Gomez out for two months
体坛英语资讯:Injured Roddick withdraws from Shanghai Masters
体坛英语资讯:Nadal eliminated, other top-4 seeds through at Shanghai Masters
体坛英语资讯:Southern Chinas Guangzhou stepping up security for Asian Games
体坛英语资讯:Palmeiras and Ceara draw 1-1
体坛英语资讯:Mano Menezes reveals plans for Ronaldinho Gaucho
学好语文 Learning Chinese
体坛英语资讯:Villarreal draw away to Hercules
体坛英语资讯:Roma lose to Basel 3-1 in Champions League
体坛英语资讯:New Zealand wins two more gold medals in Commonwealth Games
体坛英语资讯:Colo Colo players back Torres
体坛英语资讯:Dutch maintain perfect momentum with easy win over Swedes
体坛英语资讯:Vitoria beats Gremio Prudente 2-0
体坛英语资讯:Chilean Cereceda barred for positive doping
鲍勃迪伦无视诺贝尔奖邀请?! 这TM就很尴尬了
体坛英语资讯:AC Milan beat Chievo 3-1
体坛英语资讯:Putin hopes Russia to host 2018 World Cup
体坛英语资讯:Ronaldo, Kaka greet rescued miners in Chile
体坛英语资讯:Chelsea held scoreless at Villa
体坛英语资讯:Elite counter-terror police unit formed to guard Guangzhou Asian Games
原来想做老师要付出这么多
体坛英语资讯:Ronaldo wants Parreira as coach
体坛英语资讯:Messi the hero as Barcelona beats Copenhagen in Champions League
体坛英语资讯:Lazio back to top with win over Bari
体坛英语资讯:Mourinho hails Real Madrids win over Milan
体坛英语资讯:Inter hold off Hotspur, as Barca, Man United win
体坛英语资讯:Georgian judo chief coach resigns over Olympic gold medalist being expelled from 2010 worlds
李克强总理在中国—葡语国家经贸合作论坛第五届部长级会议开幕式上的主旨演讲3
文明旅游 Travel Politely
体坛英语资讯:Barcelona defeats Valencia while Real Madrid goes top in Spain