同位语从句对先行词进行解释说明,整个同位语从句等于先行词,定语从句的引导词等于先行词。
引导词有1.that eg:The idea that you can do this work well without thinking is quite wrong
2.whether eg:The question whether we should call in a specialist was answered by the family doctor
3.连接代词what, who, whom, whose, which
1).I have no idea what size shoes she wears
2).I have no idea which wine is best—it’s a matter of personal taste.
3).The question who will take his place is still not clear.