The bus is leaving soon为什么要用is leaving?

The bus is leaving soon为什么要用is leaving? be quick.the bus is leaving They say that he is leaving soon. ____________he is leaving. the teacher is waiting for the students leaving.为什么用leaving而 八年英语：The train is leaving soon(同义句） The fox is leaving sadly. She is leaving the second week in july这句话为什么 leaving后面没有跟介词 When is your brother leaving home? 为什么是leaving? Will you please drive---- The train is leaving soon.A.quick The train is leaving soon .but JIM hasn't come yet Tom is leaving for Shanghai soon.的同义句. Hello,everyone.The bus is leaving in a few minute So I'd jus