2.连接副词when,where,why,how等有意义,在从句中作状语。如:
Do you know where the accident happened?
She always thinks of how she can work well.
【典例分析】(2012·四川高考)Scientists study______human brains work to make computers.
A.when
B.how
C.that
D.whether
答案为B项。句意:科学家通过研究人类大脑是如何运转来制造出电脑的。该句中说明的是大脑运转的方式,因此应选how引导该宾语从句。
(2010·湖南高考)Cindy shut the door heavily and burst into tears.No one in the office knew ______ she was so angry.
A.where
B.whether
C.that
D.why
答案为D项。句意:辛迪重重地关上门,突然大哭起来。办公室里没人知道她为什么那么生气。由句意可知,从句中缺少原因状语,故选D项。
3.连词that,whether,if无意义或意义不完整,在从句中不担任成分。与or not连用常用whether,而不用if;作介词宾语要用whether不能用if;从句是否定句时一般用if引导。如:
Everything depends on whether we have enough money.
He doesn't care if it isn't a fine day.
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