He was very ill before he died.一般過(guò)去時(shí),指一種狀態(tài)：他死前病的很?chē)?yán)重.
He had been very ill before he died.過(guò)去完成時(shí),指一個(gè)狀態(tài)在過(guò)去的某段時(shí)間內(nèi)一直持續(xù),：他一直病得很重,直到他死.???????????????After you left, we all missed you. After you had left, we all missed you. ?????????????????????????????????had????????????仰??????ɡ????????????仰????????????????????????????????????????????????????????????had???????????????????????????????????????????????????????left??,???????????????????????????????????????????????????????????????????You had left a month ??