名词性从句的引导词有哪些

投稿:tina作者:佚名 [我的文集]来源: 时间:2016-04-23 15:32:35 阅读:59

   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(7个):when, where, how, why, whenever, wherever, however

  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.

  比较

  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.引导同位语从句时。