what she wants to know is which dress she should buy

问题描述:

what she wants to know is which dress she should buy
是个什么从句,并帮我分析下
主语从句还是表语从句?

主语从句,及表语从句.(what she wants to know)is [which dress she should buy].()中的完整句子作为后面句子的主语,叫做主语从句.[]中的完整句子,作为系动词is的表语,叫做表语从句.译为:她想知道的是她该买哪条...