l don't know when we shall leave for Nacjing (改为简单句）

I don't know when we shall leave for Moon Bay.(改为简单句)为什么用to? We don't know when we shall leave for Nanjing. I don't know when we shall meet again .(改为简单句） I don't know when we shall start.(改为简单句) I don't know ____ _ l don't know when l shall start the work (改为同义句） l don't kno 初中英语（急）we don't know when we shall begin the holiday.（改写成简单句 句型转换We don't know when we shall give a fashion show.（改为同义句）W 英语改写句子,急用I don’t know when i shall start the work （改为简单句）I d I don't know when we should leave for Nanjing. l don,t kuow when we shall meet again变成简单句 We don`t know when we shall start .(改为to do 的结构） We don`t kn we don't know when we'll start.(改为简单句)