"when are we leaving"为什么不是"when do we leave"

when are we leaving为什么不是when do we leave we are leaving now. Tell he we are leaving. We are leaving for Changsha tomorrow Tell he we are leaving哪里有错 when are you leaving?怎么完整回答when are you leaving?tomorrow怎么完整回答 Now we are in Beijing.We are ______Beijing tomorrow. A.leaving B.leaving for What should tourist take with them?Where are you leaving from?When are you leaving? Where are you leaving from?的回答When are you leaving?的回答 when we are can you tell me when are you leaving for Chendu? when are you london paris 为什么要填leaving,for when are you leaving to Shanghai?哪里错了? when are you leaving Beijing to Shanghai ?哪里错了? when are you london parisa leave go tob leaving forc leaving from to when we are little ,we are friends . are leaving tell we him 连词成句 (陈述句) we are leaving tomorrow?为什么可以用ING形式