表存在狀態和持續：look，owe，be……

　　when 和while的用法區別

　　兩者的區別如下：

　　1.when是at or during the time that， 既指時間點，也可指一段時間；

　　while是during the time that，只指一段時間，因此when引導的時間狀語從句中的動詞可以是終止性動詞，也可以是延續性動詞，而while從句中的動詞必須是延續性動詞。

　　2.when 說明從句的動作和主句的動作可以是同時，也可以是先后發生；while 則強調主句的動作在從句動作的發生的過程中或主從句兩個動作同時發生。

　　3.由when引導的時間狀語從句，主句用過去進行時，從句應用一般過去時；如果從句和主句的動作同時發生，兩句都用過去進行時的時候，多用while引導，如：

　　When the teacher came in， we were talking.

　　當此句改變主從句的位置時，則為：

　　While we were talking， the teacher came in.

　　專項練習題

　　一.用動詞的適當形式填空。

　　1.I_____(have) my breakfast at half past six yesterday morning.

　　2.Mary_____(go) over her lessons from six to seven last night. John and peter____(do) the same thing.

　　3.What_____you___(do) at that time？We_____(watch) TV.

　　4.Was your father at home yesterday evening？Yes，he was. He_____(listen) to the radio.

　　5.They_____(not make) a model ship when I saw him.

　　6._____they____(have) a meeting at 4 yesterday afternoon？

　　No， they _____. They _____ (clean) the classroom.

　　7.______it_____(rain) when you left school？ Yes， it____. (No， it____)

　　8.What_____your father_____(do) when he was your age？

　　9.One day， Edison_____(wait) for a train to arrive， and suddenly a little boy ran to the track(軌道) to play.

　　10.He asked me if I______ (go) fishing that afternoon.

　　11.The three of them were in a hurry because their plane _____(leave) in five minutes.

　　12.In a letter， john told us that he_____(come) to china next month.

　　13.When the bell rang， jenny_____(wait) in her seat.

　　14.She_____ (make) her dress the whole afternoon.

　　15.While my father____ (look) through the evening paper， he suddenly____ a cry.

　　二.選擇題。

　　1.I ______ cooked a meal when you _____ me.

　　A.cooked， were ringing

　　B. was cooking， rang

　　C. was cooking， were ringing

　　D. cooked， rang

　　2.He said he_____to draw a plane on the blackboard at that time.

　　A.tries

　　B.tried

　　C.was trying

　　D.will try

　　3.While she ______ TV， she ______ a sound outside the room.

　　A.was watching， was hearing

　　B.watched， was hearing

　　C.watched， heard

　　D.was watching， heard

　　4.They _____ a football game from 7 to 9 last night.

　　A.were watching

　　B.watch

　　C.watched

　　D.are watching

　　5.What book ____ you ______ when I ____ you at four yesterday afternoon？

　　A.did， read， was seeing

　　B. did， read， saw

　　C.were， reading， saw

　　D.were， reading， was seeing

　　6.It was Friday evening. Mr and Mrs. Green _____ ready to fly to England.

　　A.are getting

　　B.get

　　C.were getting

　　D.got

　　7.Lei Feng _____ always _____ of others when he ______ in the army.

　　A.is， thinking， was

　　B.was， thinking， is

　　C.did， think， is

　　D.was， thinking， was

　　8.A girl ______ my pen fall off the table when she _____ me.

　　A.saw， passed

　　B.was seeing， passed

　　C.was seeing， passed

　　D.was seeing， was passing

　　9.We____for tom at ten last Sunday.He often kept us ______.

　　A.were waiting， waiting

　　B.were waiting， wait

　　C.waited， waiting

　　D.waited， wait

　　10.He ____ his father on the farm the whole afternoon last Saturday.

　　A.helps

　　B.would help

　　C.was helping

　　D.is helping

　　11.While mother _______ some washing， I _____ a kite for Kate.

　　A.did， made

　　B.was doing， made

　　C.was doing， was making

　　D.did， was making

　　12.“_______ you angry then？”“they ______ too much noise.”

　　A.are， were making

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