l don t think you need leaving today.为什么要用leaving而

l don t think you need leaving today.为什么要用leaving而 I'm leaving you today. The bus is leaving soon为什么要用is leaving? are you leaving the office early today? the teacher is waiting for the students leaving.为什么用leaving而 Don\'t you think the windows need 后面为什么要填cleaning或 为什么After leaving school的leaving要改为left? They are leaving for Beijing tomorrow.为什么用“are leaving”? Leaving for New York tomorrow?为什么这里用leaving? when are you london paris 为什么要填leaving,for If you don't change your attitude,I'm leaving.怎么翻译?I'm leavi If you don't have anything to say,I _____ .(A).leaving (B).a