were having是過去進(jìn)行時,表示過去某個時間正在做什么,如：we were having a meeting when the boss came in
are having是現(xiàn)在進(jìn)行時,表示說話時正在做的事,如：we are having breakfast
will have是將來時,表示將來將發(fā)生的事情,如：we will have a meeting tomorrow morning
have是一般現(xiàn)在時,表示事物的常態(tài),如：we have English class every day