when,if,that,why,what的用法和区别答:这几个词都可以引导名词性从句。 一、 引导名词性从句的连接词 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) 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...
问if that what作宾语从句时,有何区别?答:在think,suppose,believe,presume(假使)dare等后时,that往往省略.(2)由连接代词或副词what,when,where,which,who,whom,whether(if),how, why等引导的宾语从句 如:We don't konw what Tom will do next.又如:I wonder if I have made a mistake.2.作介词的宾语:介词后的宾语从句一般用连接代词...