We don't know when we shall leave for Nanjing.
We don't know when we shall leave for Nanjing.
I don't know when we should leave for Nanjing.
I do not know when we shall leave for Nanjing.
I don't know when we should leave for Nanjing.=
I don't know when we shall leave for Moon Bay.(改为简单句)为什么用to?
I don’t know when we shall start the work.
When shall we leave for China?
We don`t know when we shall start .(改为to do 的结构) We don`t kn
we don't know when___(leave)
—When shall we leave?
I don't know when we shall start.(改为简单句) I don't know ____ _
I don't know when we will leave the city.(同义句) I don't know(