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。例如:
As we know, smoking is harmful to ones health. 如我们所知,吸烟有害健康。
The sun heats the earth, which is very important to us. 太阳使地球暖起来,这对我们人类很重要。
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 sameas;suchas 中的as 是一种固定结构, 和一样。例如:
I have got into the same trouble as he (has)。 我碰到了跟他一样的麻烦。
例2. as可引导非限制性从句,常带有正如.例如:
As we know, smoking is harmful to ones health. 如我们所知,吸烟有害健康。
As is known, 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。
国内英语资讯:Syria flies back 150 stranded in Qatar amid COVID-19 pandemic
娱乐英语资讯:China launches 5-year archaeology project on earliest dynasty
国内英语资讯:Chinas top legislator stresses soil protection
研究:轻声歌唱和讲话能降低新冠病毒传播风险
国内英语资讯:China, ASEAN ministers applaud robust bilateral trade, investment growth despite COVID-19
国内英语资讯:DPP decision on U.S. agricultural imports politically motivated: mainland spokesperson
娱乐英语资讯:Feature: Film fans miss cinema experience as Sarajevo Film Festival held online amid pandemic
国内英语资讯:Turkish president says Turkey achieves solid progress in defense industry
国内英语资讯:China supports TikTok using legal weapons to defend its interests
揭秘:人的个性会随着年龄增长而改变吗?
国内英语资讯:China, Vietnam pledge peaceful, friendly border of common development
国内英语资讯:Flooding kills 6 in Turkeys Black Sea province
波音将进行第二轮裁员
香港大学证实有康复者二次感染新冠病毒 属全球首例
联合国报告:全球三分之一儿童无法进行远程学习
国内英语资讯:China urges U.S. to handle Taiwan-related issues prudently
国内英语资讯:China, France vow to uphold multilateralism
国内英语资讯:Mekong countries vow to boost Lancang-Mekong cooperation with China
国内英语资讯:Trump to speak every night of upcoming Republican National Convention: campaign official
国内英语资讯:Political advisors urged to increase contributions to economic, social planning
应对疫情冲击 日本新干线乘客海鲜一起运
国内英语资讯:Mainland testing team assembled in Hong Kong to assist COVID-19 fight
国内英语资讯:Chinese premier raises proposals to enhance Lancang-Mekong cooperation
苹果市值突破2万亿美元
国内英语资讯:Panda twins born in northwest China
国内英语资讯:Chinese premier stresses social assistance for peoples well-being
国内英语资讯:Construction going well on China-Laos railway
国内英语资讯:Top political advisor stresses improving national governance
国内英语资讯:China urges U.S. to stop making waves in South China Sea
国内英语资讯:Chinese premier stresses flood control, consolidating economic recovery
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |