2009年高三英语精编复习资料：语法专题（名词性从句）
主语从句、表语从句、宾语从句和同位语从句, 它们在复合句中的功用相当于名词, 因此称为名词性从句, 在句中分别作主语、表语、宾语和同位语。
1.When he will come is still unknown.
2.I don’t know who has watered the fields.
3.The problem is that we need more money.
4.Have you heard the news that our team won the game?
1. 主语从句：在复合句中作句子主语的从句。
引导词：连词that、whether;疑问代词who, what, which; 疑问副词when, where, how, why
（1）连词that（无词意）, whether（是否）, 在从句中不担任句子成分, 只起连接作用; whether能引导主语从句, 而if不能。
