2022年初中英语:as, which非限定性定语从句
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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。例如: As we know, smoking is harmful to one's 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 same…as;such…as 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 one's health. 如我们所知,吸烟有害健康。 As is known, smoking is harmful to one's 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。 (责任编辑:admin) |