i don't know how old you are

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i don't know how old you are
在什么情况下,像这样的名词性从句,后面的跟着的疑问句的主谓要倒装?
为什么有些要,有些却不要,有点乱,

从句放在宾语位置,那它就是 know 的宾语从句.
当然,宾语从句分的很细,其中一种为正常语序,一种为倒装语序.
正常语序如：1.I think (he is right).
2.I want to known what his name is.
倒装语序如：
3.I want to known what Class are you in.
比较这三个句子,容易发现,宾语从句用不用倒装,关键在于所提问对象的性质及在从句中所做的句子成分.比如在第2 个句子中,所提问对象为从句的表语.
在第3个句子中,所提问对象为从句的状语.
所以现在下个定论：对从句中的定语成分,状语成分提问时,从句用的是疑问语序,也就是倒装结构.对其他从句成分提问时,从句用称述语序.
你可以找几个例子试着练习一下,验证一下这个结论.

i don't know how old you are i don't know how old you are其中how old you are是倒装吗? I don't know.How old are you?改为同义句合并英语句子.I don't know.HOW old are you?合成I don'tknow_ _ _ _.. 【合并英语句子】.I don't know.HOW old are you?合成I don'tknow_ _ _ _. 英语I don't know how old you are.Can you tell me who is on dut i don't know how to talk you but i just know you and me are You don't know how much i miss you.If you are tired,i'll be I don't know how to say to you!I only knon you are kind! I don't know where you are I don't know what are you --how many books have you ______?--I don't know.they are all