Unit 8 Natural disasters Grammar 课件(共30张PPT)

(共30张PPT)
Unit 8 Natural disasters
Grammar
.2.
To learn to use the past continuous tense to talk about things that were happening for some time in the past.
To learn to use past continuous tense with ‘while’ ,‘when’ and ‘as’
Learning Objectives
Revision
1.What was Timmy doing when the earthquake started
2.What were people doing while pieces of glass and
bricks were falling down
3.What was Timmy doing when he suddenly heard some noise above him
Grammar
Past continuous tense
What was Timmy doing when the earthquake started
He was sleeping when it started .
was doing
Why don’t we use “is doing”
Because we talk about things that happen in the past (在过去) not now.
be (was/were) + verb-ing
Presentation
Past continuous tense
--Tim
play
football.
was
ing
--Lily
was
read
books
ing
--What was Tim doing when you saw him
--What was Lily doing at 2:30 p.m yesterday
at 2:30 p.m yesterday.
What were they doing
Presentation
过去进行时
1.基本概念：表示过去某一时刻正在进行的动作或过去某一段时间内持续进行的动作
2 常用时间状语：
1)then, at this/that time, at 9.00 last night …
2) this morning, the whole day/morning, from 8-10pm last evening.…
Past continuous tense
1. 过去进行时主要表示在过去某一时刻正在进行的动作。
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
a) From 1983 to 1998, he was teaching at Yale.
b) They were building a hall last winter.
We use “was doing” with the pronouns(代词)
______,_______,______and ______.
We use “were doing” with the pronouns(代词)
______, ______ and ______.
过去进行时的句式
1) 肯定句:
2) 否定句：
主语 + was/ were + V-ing
we you they
I he she it
was/were not + V-ing
was not = wasn’t
were not = weren’t
Let's guess
Was it….
Were they…
Yes, ...was/were .
No, ...wasn’t/weren’t.
Was he….
Were they…
Yes, ...was/were .
No, ...wasn’t/weren’t.
Let's guess
过去进行时的句式
（3）一般疑问句及回答：
Was/Were…doing
Yes, … was/ were.
No, … wasn’t/ weren’t.
（4）特殊疑问句：
疑问词 + was/were +主语 + V-ing …
Presentation
A
A snowstorm hit Sunshine Town. Mr. Wu is asking the students about plete their conversation with the correct forms of the verbs in brackets.
Mr. Wu: What a terrible snowstorm! It started at about seven this morning. I _____________ (read) the newspaper then. What _____ you ______ (do), Simon
Simon: I ___________ (have) breakfast.
was reading
were doing
was having
Mr. Wu: What about you, Millie
Millie: I ____________ (walk) to the bus stop. Sandy, I saw you and your parents standing on the side of the road. _____ you _______ (wait) for a taxi
Sandy: Yes. My dad’s car broke down because of the cold weather. He __________ (ring) someone to come and help when you saw me.
was walking
Were
waiting
was ringing
（在路边）
when, while &as
while, when and as 都表示“当…的时候”
这三个连词都可引导时间状语从句，但用法有所不同。
Grammar
the snowstorm came.
What was Mr. Wu doing at that time
He was reading the newspaper
when
the simple past tense
the past continuous tense
the long action
the short action
Rule: When a short action happened at the same time as a long action, we can use “________” before the short action.
when
When the snowstorm came he was reading the newspaper .
,
Presentation
the past continuous tense
Rule: When a short action happened at the same time as a long action, we can use “______________” before the long action.
What was Simon doing
he was having the breakfast.
when/while/as
When/while/as he was having the breakfast, the snowstorm came.
the simple past tense
the long action
when/while/as
the short action
The snowstorm came
the past continuous tense
the past continuous tense
Rule: We can use “_______” to join two long actions.
What was Millie doing
Millie was walking to the bus stop
while
the long action
the long action
while
Sandy was waiting for a taxi.
What about Sandy
Discussion
Short action with when ,when,
Long action with as, while,
Long action also with when.
As, while, when,
we can understand!
As, while ,when,
We can understand!
how to use
B
Some Class 1, Grade 8 students went to play in the plete the sentences with the correct forms of the verbs in blanks. Use when, while and as to connect the sentences.
1. _______ Simon ________ (arrive), Amy ___________ (get) （抓、取）some snow from the ground.
2. _______ Suzy and Kitty ____________ (build) a snowman, Millie ___________ (take) photos.
3. Daniel _______ (fall) over _____________ he __________ (make) a big snowball.
4. Peter __________ (hide) behind a tree ______ a snowball ____ (hit) him.
5. ____________ Millie and her classmates ____________ (play) in the snow, Andy ___________ (run) towards them.
When
arrived
fell
while/as/when
was making
While
were building
was taking
was getting
was hiding
when
hit
While
were playing
was running
Extension
过去进行时与一般过去时的区别
1. 过去进行时着重描述当时正在进行的动作，它的特点是：未完成，强调过程；
2. 一般过去时表示一个已经完成的动作，表示动作发生过，而且已经结束了，强调结果。
Mary __________ a dress when she cut her finger.
A. made B. is making
C. was making D. makes
【解析】was making表示正在做衣服的过程，如用made则表示这一动作已结束，做衣服的动作已结束与cut her finger就没有联系。
2. He _________(write) a letter, then went to bed．
【解析】wrote表示动作已结束，做另一件事，如用 was writing就与went to bed在逻辑上相矛盾。
wrote
Exercise
过去进行时与一般过去时的区别
1. 过去进行时侧重表示动作的延续；
2. 一般过去时表示过去某时发生过某事.
He __________（write）all night last night.
He _____ something last night.
was writing
wrote
(他一直写……)
(说明他写了……的事实)
Extension
注：下列几类动词通常不用于进行时。
① 表示状态的动词be
② 感官动词：feel, hear, sound, look, smell, taste等
③ 表示思维或心理状态的动词：believe, forget, consider(认为), know, remember, hope, wish, want等
④ 表示所属关系的动词: belong, have, own, hold（容纳）等
Extension
Summary
1. 过去进行时主要表示：
在过去某一时刻正在进行的动作
在过去某段时间一直在进行的动作
2. 过去进行时的句式
(1) 基本结构：was / were + verb-ing
(2) 否定式：was / were not + verb-ing
(3) 疑问句：将 was / were 调到主语前
3. 连词 while, when and as 与过去进行时
What ______you _______(do) at this time yesterday.
He ____________(watch) TV from 8p.m. to 10p.m.
3. John __________(fly) kites in the park at 9 a.m. yesterday
morning.
4.Sandy ___________(call) Daniel at that time.
5.He ___________(read) while his brother ____________
(watch) TV.
6.They ______________ (chat) when their teacher _______
(come) into the classroom.
were
doing
was watching
was flying
was calling
was reading
was watching
were chatting
came
Exercise
C
--- What were you doing this time yesterday
--- I _____ on the grass and drawing a picture. [2012北京]
A. sit B. sat
C. am sitting D. was sitting
2. When I came back yesterday evening, my brother _____
his homework. [2012长沙]
A. is doing B. has done
C. was doing
C
3. --- I called you at 4:00 yesterday afternoon, but no one answered.
--- Sorry, I _____ with my friends at that time. [2012河南]
A. swim B. swam
C. will swim D. was swimming
判断正误：
When he woke up, his mother was cooking.
2. While he woke up, it was still raining heavily.
3. When/While/As I was waiting for a bus, I met her.
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GOOD JOB