I do not know when we shall leave for Nanjing.

I do not 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 don't know when we should leave for Nanjing.= When shall we meet?I do not know(合为一句) I do not know ___ ___ I don't know when we shall leave for Moon Bay.(改为简单句)为什么用to? When shall we leave for China? We do not know when we shall give a fashion show.同义句 when do you think we shall leave for shanghai?如何分析这个句子结构 I do not know when to leave 与Please turn off the light when We do not know when it should be leave 同义句是什么 —When shall we leave?