(一)
過去進行時主要用于:
表示過去某個時刻或階段正在進行的動作。
e.g. At that time she was working in a PLA unit.
那時她在解放軍某部工作。
What were you doing this time yesterday?
與這個時態(tài)連用的時間狀語常用:
at nine o`clock, this time last night, these days, at that time 等。
用 when 引導的時間狀語從句表示主句的動作正在進行的時間。
e.g. When he came in, I was reading a newspaper.
注:
1 、 while 引導時間狀語從句敘述過去的動作時,從句常用過去進行時。
e.g. I read a magazine while I was waiting for the bus.
2 、 when 用作并列連詞,意為“這時”,連接兩分句時,第一句多用過去進行時。
e.g. I was reading a newspaper when he came in.
一般過去時與過去進行時的區(qū)別:
一般過去時:強調(diào)過去某一時間開始或完成的動作。
過去進行時:強調(diào)過去某一時間正在進行的動作。
試區(qū)別下面兩句: We were building a reservoir last winter.
去年冬天我們在修建一座水庫。(可能尚未建成) We built a reservoir last winter.
去年冬天我們修建了一座水庫。(已經(jīng)建成)
(二)
一般過去時現(xiàn)在完成時主要用于:
1 、表示到現(xiàn)在為止這一時期中發(fā)生的動作或情況,即多次動作的總和。
e.g. We have learnt four English songs this month.
How many times have you read the novel?
For many days we haven`t seen each other.
2 、表示對現(xiàn)在有影響的某一已發(fā)生的動作。
e.g. The delegation has left 代表團已經(jīng)走了(說明現(xiàn)在不在這里)
Look, what you have done. 看你干的事。
與這一時態(tài)連用的時間狀語有:
already, yet, just, ever, never, by now, so far, recently, by the end of this month, since, for 短語,連詞 since 引導的時間狀語從句。
一般過去時與現(xiàn)在完成時的區(qū)別:
一般過去時:重在說明動作在過去發(fā)生時的具體情況(時間、地點、方式、對象、細節(jié)等)。
現(xiàn)在完成時:只提起已發(fā)生的動作(事實)及其影響,不說明動作發(fā)生時的具體情況。
cf. Have you had your lunch?
What did you have for lunch?
I have ever been to the Great Wall,_and_I went there last summer with my father.
注:現(xiàn)在完成時表達的動作常具有反復性,故下面一句是錯的:
Have you seen the six thirty`s news program?
應改為:
Did you see the six thirty`s news program?