Grammar and usage -Noun Clauses 名词性从句 名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句可分为主语从句、表语从句 、宾语从句和同位语从句。1.Whenwewillstartisnotclear.2.Shewontbelievethathersonhasbecomeathief.3.Myideaisthatweshoulddoitrightnow.4.Ihadnoideathatyouwereherfriend.主语从句宾语从句表语从句同位语从句I名词性从句的种类主语从句一般有三种结构：1. 主语从句+谓语That shewillwinthematchiscertain.2.It+be+形容词（名词词组、过去分词）+that从句Itisimportant that weteensshouldlearnEnglish.Itisgoodnewsthathewillattendthemeetingonbehalfofourschool.Itissaidthatourschoolwillholdasportsmeeting3.It
