what she wants to know is which dress she should buy

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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裙子.
所以,本句存在两个从句.主语和表语均用从句表示.

what she wants to know is which dress she should buy ______ is what she wants to know. 1、What color is your dress?She wants to know.(连接两句变成宾语从句) wants to know what she ------the transportation ______ is what she wants to know.a.Who to do it b.Whom to do 128. ______ is what she wants to know. a. Who to do it b. Wh what is she going to buy? She is going shopping.What is she going to buy? She wants to know ______ . She wants to buy that beautiful dress her daughter a good pr 英语改错 She wants to buy such a nice dress like yours Kitty really didn't know which dress she should choose化成简单句