Past continuous ten
一、过去进行时表示在过去某一时刻或某一段时间内正在进行或发生的动作。
形式为was /were + V-ing。
常与表示过去的时间状语连用，如：last night, last Saturday等；或者与when, while, as引导的过去时间状语连用。
1. 冬天的作文过去进行时主要表示在过去某一时刻正在进行的动作。
e.g. They were eating breakfast at 7:00 am yesterday.
2. 在过去某段时间一直在进行的动作
e.g. From 1983 to 1998, he was teaching at Yale.
According to Chine ntences fill in the blanks
1. I ________ my homework when Mike _____ last night. 昨天晚上迈克来的时候我正在写
作业。
2. While Ann ____________TV, her father ___ home. 安正在看电视时，她父亲回来了。
3. What were you doing when I ________ at the door? 我敲门的时候你在干什么？
4. She _____________ the room when I ____ to e her. 我去看她的时候她不是在打扫房间。
5. I ________my vocation England this time last summer. 去年夏天的这个时候我正在英国度假。
二、while, when and as 都表示“当……的时候”。
e.g. I was sleeping when the earthquake started.
People were running in all directions while pieces of glass and bricks were falling down.
As I was trying to find my way out, I suddenly heard some noi above me.
1. 当连接同时发生的两个延续性长动作时，常用while引导。
e.g. While I was watching TV, he was listening to music.
Millie was reading a book while Eddie was sleeping.
2. 如果短暂性的动作是主句时，我们可以用when, while 或 as 引导。
e.g. When/while/as Millie was watching TV, Andy came into the room.
3. 如果延续性的动作是主句时，我们经常用when 来连接。画画书
e.g. Millie was watching TV when Andy came into the room.
4. 如果两个短暂性的动作同时发生，我们通常用as 连接。
e.g. As Millie sat down on the sofa, Andy came into the room.
注： 当一个短暂性动作发生的同时伴随着一个延续性的动作，这时我们通常用过去进行时来表示延续性的动作，用一般过去时来表示短暂性的动作。
三、when ,while 的区别
I was reading when you came in. I was reading when you were sleeping.
When引导的时间状语从句，谓语是延续性的，或者短暂性的。通常用一般过去时，也可以用进行时。
My mother was watching TV while I was doing my homework.
He was taking a shower while his wife was talking on the phone.
while捐赠仪式发言稿引导的时间状语从句，谓语动词只能是延续性的，通常用进行时。
The teacher came in ____ students were talking noisily.
=The students were talking noisily ___ the teacher came in.
标准化体系
when 后通常加短暂性动词，如：
arrive, come in, get up, open, clo, finish, begin, come, go, arrive, reach, get to, leave, move, borrow, buy, die, knock 等
While后通常加延续性动词, 如：live, run, stay, clean, play, hold, watch, teach, read, study, teach, eat, drink, write, dance, sing, smoke 等
小结：
连接词类别 | 作 用 | 例 句 |
as | as 表示“当……的时候”，往往和 when/ while 通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。 | 1.She came up as I was cooking.（同时） 2.The runners started as the gun went off.（几乎同时） |
when | 既可以表示在某一点的时候，又可表示在某一段时间内。 when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用 ; when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生。 | 1.When we were at school, we went to the library every day.（在一段时间内） 2.Sorry，I was out when you called me．（call为短暂性动词）对不起，你打电话时我刚好外出了。 3. When I got to the airport，the guests had left．（got to后发生）当我赶到飞机场时，客人们已经离开了。 |
while | while 意思是“当……的时候”或“在某一段时间里”。 从句动作和主句动作同时发生，且从句动作为延续性动词时，when，while，as都可使用。 主句中的动作或事情是在从句中的动作或事情的进展过程中发生，从句中的动词一般要用延续性动词。 | 1.When ／While ／As we were dancing，a stranger came in．（dance为延续性动词）。 2.Plea don’t talk so loud while others are working. |
| | |
1. I _________ my homework when Mike _____ last night.
成年人的爱情 昨天晚上迈克来的时候我正在写作业。
2. While Ann ______________ TV, her father _________ home.
安正在看电视时，她父亲回来了。
狸字组词 3. What were you doing when I ________ at the door?
我敲门的时候你在干什么？
召集的近义词
4. She ______________ the room when I ____ to e her.
我去看她的时候她不是在打扫房间。
5. I ____________ my vocation in England (at) this time last summer.
去年夏天的这个时候我正在英国度假。
6. Mary ___________ while Peter ___________ the piano.
Mary在跳舞，而Peter在弹钢琴。
超链接打不开7. They ____________ the newspaper when I __________ the room.
我走进屋子时他们正在看报纸。
8. What _____ you _______ at five yesterday afternoon?
昨天下午5点你在做什么？
