高考英语语法
2. 引导词及其作用不同。引导定语从句的词是关系词,常见的关系词有that , which , who , whose , whom , when , where , why , as 等。关系词除了连接主从句的作用外,还在定语从句中充当一定的句子成分,如主语、宾语、状语、定语、表语等。引导同位语从句的that只起连接主从句的作用,不在从句中担任任何成分。whether 和 how 可以引导同位语从句,但不能引导定语从句。
The news that / which you heard isn't true. 你听到的那个消息不真实。(定语从句,关系代词作从句heard 的宾语。)
The book that you bought yesterday is worth reading. 你昨天买的那本书值得一读。(定语从句)
I have a doubt whether he will be warmly welcomed . 我怀疑他是否能受到热