你什么时候离开
When had you left?
为什么要离开
Why did you leave?
你什么时候回来?
When will you back?
为什么不回来?
Why will you not back?
问题补充：你就像空气,我可以暂时不呼吸,却无法持续.
You are my air,I can hold my breath temporary,but I can not persist in it.
你就像空气,无时无刻围绕在我身边,而我却无视你的存在.
You are my air,always around me.But I ignore your existence.
你就像空气,你消消地走了,而我却无法呼吸.
You are my air.French leave.And I can not breathe forever.
我喜欢这段话