最新while和when引导的时间状语从句主句用一般时

while和when引导的时间状语从句,主句用（一般过去时）从句用（过
去进行）.while引导的从句要加延续性动词，而when 延续和短暂
性动词都可以，。
6. 另外，when和while的区别还在于：while引 导的时间状语从句
多用过去进行时态，而when引导的时间状语从句多用一般过去时
态。
While they were talking , the bell rang.
正在他们谈话的时候，上课铃响了。
I was doing my homework when my mother came back home
yesterday evening.
昨天晚上妈妈回家的时候，我正在做家庭作业。
I am cooking while Jane is practicing.
我在做饭的时候简正在练习。
当此句改变主从句的位置时，则用when引导。
When the teacher came in，we were talking
They were sweeping the floor when the teacher came in.
老师进来时（这一时刻），他们在擦地板。
While they were sweeping the floor，the teacher came in.
他们正擦地板时（这段时间），老师进来了。

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。例如：
They were singing while we were dancing.
He fell asleep when he was reading. 他看书时睡着了。

1. While we____(wait)for the bus,a girl__________(run)up to
us.
2.I__________(telephone)a
Bob__________(come)in.
mother______(put)Cathy to bed,the door
friend when
bell_______(ring).
I________(walk)in the park,it__________(begin) to rain.
____(read)when they______(hear)a knock at the door.
1.I_____(have)my breakfast t at half past six yesterday morning.
_____you___(do)at that time? We_____(watch)TV.
6.____they___(have)a meeting at 4 yesterday
afternoon?No,they_____.They_____(clean)the classroom.
the bell rang,jenny_____(wait )in her seat.
_____(make)her dress the whole afternoon.

1 .I ______ a meal when you _____ me.
a. cooked, were ringing b. was cooking, rang
c. was cooking, were ringing d. cooked, rang
said he _____ to draw a plane on the blackboard at that time.
a. tries b. tried c. was trying d. will try
she ______ TV, she ______ a sound outside the room.
a. was watching, was hearing b. watched, was hearing
c. watched, heard d. was watching, heard
_____ a football game from 7 to 9 last night.
a. were watching b. watch c. watched d. are watching
____ his father on the farm the whole afternoon last Saturday.
a. helps b. would help c. was helping d. is helping
mother _______ some washing, I _____ a kite for Kate.
a. did, made b. was doing, made c. was doing, was
making d. did, was making

____ some cooking at that time, so he _____ me
a. did, heard b. did, didn't hear c. was doing, heard d. was
doing, didn't hear
time yesterday jack _____ his bike. He _____ TV
a. repaired, didn't watch b. was repairing, watched
c. repaired, watched d. was repairing, wasn't watching