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　　表存在状态和持续：look，owe，be……

　　when 和while的用法区别

　　两者的区别如下：

　　1.when是at or during the time that， 既指时间点，也可指一段时间；

　　while是during the time that，只指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。

　　2.when 说明从句的动作和主句的动作可以是同时，也可以是先后发生；while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。

　　3.由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while引导，如：

　　When the teacher came in， we were talking.

　　当此句改变主从句的位置时，则为：

　　While we were talking， the teacher came in.

　　专项练习题

　　一.用动词的适当形式填空。

　　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(轨道) 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.选择题。

　　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