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(共24张PPT)
Unit 5 Nature’s Temper
Section A What happens during a natural disaster
(4a-4d)
Learning Objectives
1. understand the form and function of the past continuous
tense.
2. differentiate the use of “when” and “while” in past
continuous tense.
3. apply the past continuous tense orally and in writing.
In this lesson you will:
Look and Say
What is happening right now
It is raining heavily.
A truck is driving on the street.
Some people are walking in the water.
A reporter is taking photos for the people.
If this situation happened last week. Can you describe what was happening when the typhoon hit
It was raining heavily.
A truck was driving on the street.
Some people were walking in the water.
A reporter was taking photos for the people.
What’s the difference between these sentences
It is raining heavily. It was raining heavily.
A truck is driving on the street. A truck was driving on the street.
Some people are walking in the water. Some people were walking in the water.
A reporter is taking photos for the people. A reporter was taking photos for the people.
be+v-ing is used for actions happening now
was/were+v-ing is for actions that were happening in the past
present continuous tense
past continuous tense
Read the sentences. Underline the verbs which show an ongoing action in the past.
4a
What were you doing while it was snowing heavily I was travelling on the train then.
What were your family doing when the typhoon hit My children and I were reading together.
When my neighbour called, my family were having dinner. We were driving home when the strong winds started. While we were driving home, the strong winds started. It was raining hard while we were driving back. Think and Discuss
What are the differences between when and while when used in past continuous tense
What were you doing while it was snowing heavily
What were your family doing when the typhoon hit
When my neighbour called, my family were having dinner.
While we were driving home, the strong winds started.
It was raining hard while we were driving back.
过去进行时的基本用法
过去进行时表示过去某个时刻或某一阶段正在进行的动作。
过去进行时表示在过去某个确定的时间点或某一段时间里正在发生的动作。
因此，原则上常和表示过去的时间状语连用。例如：then, at this/that time, yesterday, last night。
E.g. I was playing volleyball with my friends yesterday
afternoon.
I was doing my homework while my sister was watching TV last night.
有些情况下，句子中没有明确表示时间的状语，但从句
子的上下文中可以得知这是在过去某一时间内正在进行的动作。
E.g. We didn’t go shopping as it was raining heavily.
It was a very cold night and a terrible wind was blowing.
过去进行时中when和while的区别
when可以表示时间点，也可以表示时间段，后面既可以+延续性动词，也可以+非延续性动词，时态既可以是一般过去时，也可以是过去进行时。
E.g. I was sleeping when the doorbell rang.
When I was reading English words, my mother came in.
while仅表示时间段，引导表示过去的时间状语从句时，从句的动词必须是延续性动词，时态用过去进行时。
E.g. He fell asleep while he was watching TV.
The fire alarm went off while we were having a meeting.
主句（瞬间动作）+ while + 从句（持续动作）
当主句和从句都为过去进行时，只能用while引导，不能用when。
E.g. We were playing basketball while it was raining.
I was reading while she was writing.
主句（持续动作） + while + 从句（持续动作）
记忆口诀：
when后“可长可短”（过去进行时、一般现在时都可以）
while后“只能长”（只能用过去进行时）
两个动作都是“长动作”（过去进行时），用while
过去进行时的句型
肯定句
主语+be (was/were)+现在分词+其他
E.g. She was playing the piano when the bell rang.
When I came home, they were cooking in the kitchen.
否定句
主语+be(was/were)+not+现在分词+其他
E.g. He wasn’t reading when I came home.
When he knocked at the door, we weren’t doing our homework.
一般疑问句
Be (Was/Were)+主语+现在分词+其他
E.g. A: Were you cooking at that time
A: Was he singing then
B: Yes, he was. / No, he wasn’t.
B: Yes, I was. / No, I wasn’t.
特殊疑问句
疑问词+be (was/were)+主语+现在分词+其他
E.g. A: What was he doing when I called you
B: He was studying at the library.
A: What were you doing when the teacher came in
B: We were discussing the homework.
过去进行时和一般过去时的区别
一般过去时只表示一个完成的动作，而过去进行时表示过去某时正在进行的动作。也就是说，用一般过去时只是表示有过这件事；用过去进行时则强调了动作的连续性。
E.g. The children watched TV yesterday night.（只说明昨晚孩子们看过电视，但看了多长时间并不知道。）
The children were watching TV yesterday evening.（不仅陈述昨晚孩子们看电视这一事实，更强调他们看电视的时间贯穿昨晚整个时间段。）
4b
Combine each pair of sentences using when or while.
1. I did my homework. The typhoon landed on the coast.
I was doing my homework when the typhoon landed on the coast.
2. The power went out. My father and I made dinner.
My father and I were making dinner when the power went out.
3. Kate wrote a letter. Her brother called to warn her of the
storm.
Kate was writing a letter when her brother called to warn her of the storm.
4. My parents packed the supplies. I moved our things off the
floor.
My parents were packing the supplies while I was moving our things off the floor.
5. I slept soundly. It rained cats and dogs.
I was sleeping soundly while it was raining cats and dogs.
rain cats and dogs
是一个常用的英语俚语，意为
“下着倾盆大雨”。
4c
Complete the passage with was, were, when, or while.
When Jenny looked up, thick black clouds were forming in the sky, and the rain ______ beating against their roof.
“Quick, this way,” said Dad.
The family ran to the safe room at once.
__________ they were waiting, Jenny's little sister started to cry. Dad gave her some chocolate and told her that they ______ hiding from an angry lion. Soon, she was laughing again.
was
When/While
were
At last, the storm passed. ______ they stepped outside, they found the sun shining. People were asking one another if they were safe while some ______ starting to clear the streets. Jenny smiled. The tornado was scary, but it also brought everyone closer together.
were
When
4d
Imagine that you are a reporter. Interview a member of Jenny's family and find out what he or she was doing around the time of the tornado.
A: What were you doing when the tornado hit
B: My family and I were hiding in a safe room.
A: What were you doing while you were waiting there
B: Oh, while I ...
Sample
A: What were you doing when the tornado hit
B: My family and I were hiding in a safe room.
A: What were you doing while you were waiting there
B: Oh, I was holding my little sister to keep her calm, while my
dad was telling us stories.
A: What happened when you came out
B: When we walked outside, we saw our neighbours. They were
cleaning up the broken branches in their yard while we were
checking our own house. Everyone was helping each other.
A: It's good to hear that. What are your feelings now
B: I'm still a little scared, but I also feel warm. When I saw
everyone working together, I knew we would be okay.

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