例： Where did your brother study before he joined the army?

　　過去完成時可表示截止過去某一時間動作的總或動作的結束。

　　例：By the end of last month. We had reviewed four books

　　By eight o`clock, he had finished his homework.

　　與這個時態連用的時間狀語常有：

　　by 1985, by eight o`clock, by then, by the end of last month, by the time when, when, as soon as, before 等連詞引導的時間狀語從句，表示主句動作結束的時間。

　　現在進行時主要用于：

　　表示現在或現階段正在進行的動作。

　　例： Listen, someone is crying.

　　What are you doing these days?

　　代替一般現在時，表示經常性動作或狀態，而含有某種感情色彩。

　　例： How are you feeling today?

　　你今天感覺怎樣?(顯得親切)

　　He is doing well in his lessons.

　　他的'功課很好。(贊揚)

　　You are always boasting.

　　你老愛吹牛。(厭煩)

　　動詞 go, come, leave, arrive 等表將要發生的動作時。

　　例：They are leaving for Shanghai.

　　與這種時態連用的時間狀語常有：

　　now, these days, recently, this week 等。