摘要:什么是名词性从句,在句子中起什么作用?更多关于CET问题,请关注希赛网英语考试频道。
一、名词性从句是在句子中起名词作用的句子。 名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等,因此根据它在句中不同的语法功能,名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
二、引导名词性从句的连接词可分为三类:
连词(5个):that (本身无意义。引导单一的宾语从句时that常可省略,但引导主语从句、表语从句、同位语从句时that通常不被省略);whether,if (均表示“是否”表明从句内容的不确定性);as if ,as though (均表示“好像”“似乎”),以上在从句中均不充当任何成分。
连接代词(10个):what/whatever, who/whoever, whom/whomever, whose/whosever, which/whichever
连接副词(8个):when/whenever, where/wherever, how/however, why,because
三、不可省略的连词:
1.介词后的连词。
2.引导主语从句和同位语从句的连词不可省略。
That she was chosen made us very happy.
We heard the news that our team had won.
3.在从句中做成分的连词。
四、whether与if均为"是否"的意思。 但在下列情况下,只可用whether:
1.whether引导主语从句并在句首。
eg:Whether he can come to the party on time depends on the traffic.
2.引导表语从句。
eg:The question is whether we can get in touch with her.
3.whether从句作介词宾语。
eg:I am thinking about whether I should quit my present job.
4.if与whether都可以与or not 连用,但后面紧跟or not 时只能用whether。
We didn't know whether or not she was ready.(此时只能用whether)
I wonder whether/if the news is true or not.(此时则二者都可以用)
5.后面直接跟动词不定式时。
6.whether可引导从句,作主语、表语、同位语而if不行。
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