名词性从句知识归纳名词性从句是指在句子中相当于名词的从句，主要包括主语从句、宾语从句、表语从句和同位语从句。名词性从句不是修饰性从句，而是复合句中的主干。e.g. That the boy failed again in the exam disappointed his mother. （主语从句） I know that he is writing his composition in his room. （宾语从句）The question is how we can finish it on time. （表语从句）The fact that some Chinese are still poor is really a great problem. （同位语从句）名词性从句的连接词：从句有无疑问含义是否有含义连接词的作用是否引导从句是否可省略是否充当从句中的成分充当从句中的哪种成分连接词Ithat无无是一般可以否无if（只用于宾语从句中）, whether有“
