名词性从句重难点剖析(3)
12、如果宾语从句后还有宾语补足语，则必须用it作形式宾语，而将宾语从句后置，并且that不能省略。
例 He has made it clear that he will not give in. 他清楚地表明他不会屈服。
13、doubt用于肯定结构时，后面用whether/ if引导名词性从句；用于否定结构或疑问结构时，后面用that引导名词性从句。be sure 用于肯定句或疑问句时，后接that引导的名词性从句；用于否定句时，后接whether/ if引导的名词性从句。
例 We doubt whether/ if he can win the game.我们怀疑他是否能赢得这场比赛。
14、连接代词whoever，whatever，whichever可引导名词性从句，相当于anyone who, anything that等。他们也可以引导让步状语从句，相当于no matter who/ what/ which。
例 Whoever breaks the law should be punished. 任何违法的人都要受到惩罚。
二、高考链接
1. It is pretty well understood ___ controls the flow of carbon dioxide in and out the atmosphere today. (2003上海)
A. that B. when
C. what D. how
2. --- I think it’s going to be a big problem.
--- Yes, it could be.
--- I wonder ___ we do about it.(2002上海春)
A. if B. how
C. what D. that
3. You should make it a rule to leave things ___ you can find them often. (1999NMET)
A. when B. where
C. then D. there