引导名词性从句的连接词可分为三类: 连接词:that,whether,if 不充当从句的任何成分)来源:考试大 连接代词:what, whatever, who, whoever, whom, whose, which. 连接副词:when, where, how, why 不可省略的连词: 1. 介词后的连词 2. 引导主语从句和同位语从句的连词不可省略。来源:考试大 That she was chosen made us very happy. We heard the news that our team had won. 比较:whether与if 均为"是否"的意思。 但在下列情况下,whether 不能被if 取代: 1. whether引导主语从句并在句首来源:考试大 2. 引导表语从句 3. whether从句作介词宾语 4. 从句后有"or not" 来源:考试大 Whether he will come is not clear.
大部分连接词引导的主语从句都可以置于句末,用 it充当形式主语。 It is not important who will go. It is still unknown which team will win the match.