Unit 8 Natural Disarster Grammar 课件(共12张PPT)

(共12张PPT)
Natural disasters
unit 8
单元语法
◎过去进行时
◎as、when、while在过去进行时中的用法
Grammar: 过去进行时
①过去进行时的形式为 was/were + 现在分词
表示过去某一时刻正在进行的动作
②过去进行时表示过去某一段时间正在进行的动作
③was coming 为 come的过去进行时，
表示在过去 将来即将发生的动作。
Grammar: 过去进行时
1. 定义：
2. 结构：
3. 常用的时间状语：
①表示过去某一时刻或某一时间段内正在进行或
发生的动作；
②arrive 、come、go 、begin、start、fly等词的过去进行时
可表示过去即将发生的动作
was/ were + doing
…when 从句(V.ed)
…while 从句(be+V.ing)
昨天下午3点到5点 from 3 p.m. to 5 p.m. yesterday
昨天这时 at this time/moment yesterday
昨天整个早上/下午 the whole morning/afternoon yesterday
那时 at that time/moment
昨晚八点 at 8 last night
Grammar: 过去进行时
句型结构:（肯定句与否定句）
was/ were (+ not)
V-ing
I
You/We/
They
He/She/It
was ( not )
were ( not )
was ( not )
running.
Grammar: 过去进行时
Was
I
Were
you/we/they
Was
he/she/it
running
Yes/No,
I
was/was not (wasn’t).
you/we/they
were/were not (weren’t).
he/she/it
was/was not (wasn’t).
Grammar: 过去进行时
句型结构:（一般疑问句）
特殊疑问词
Was
I
Were
you/we/they
Was
he/she/it
V.ing
Grammar: 过去进行时
句型结构:（特殊疑问句）
Grammar: as、when、while
在过去进行时中的用法
1._______I was watching TV, he was listening to music.
While
2. Millie was watching TV _______Andy came into the room.
3. ______Millie sat down on the sofa, Andy came into the room.
When/While/As
4. ______________Millie was watching TV, Andy came into the room.
when
As
(延续性动作)
注意点：
当连接同时发生的两个延续性长动作时，常用while引导，用进行时态。
如果延续性动作在主句时，我们经常用when 来连接
如果两个短暂性动作同时发生，我们通常用as 连接
如果短暂性动作在主句时，我们可以用when, while 或 as 引导
(延续性动作)
(主：延续性动作)
(主;短暂性动作)
(延续性动作)
(短暂性动作)
(短暂性动作)
(短暂性动作)
1.____________Lucy was playing the piano, her father came into the room.
2.Linda was playing computer games________ her mother knocked at the door.
3.______ Lily sat down on the sofa, Andy came into the room.
考点精炼
When/while/as
when
As
SUMMARY
Homework:
1.大声朗读unit8 课文20分钟。
2.掌握本节课知识点，语法点。
3.完成平台的练习。
1.过去进行时
2.as、when、while在过去进行时中的用法
Bye
bye!
To care for the environment is to care for life.
爱护环境，就是爱护生命。