资源简介

(共44张PPT)
Exploring the topic
Grammar in Use
Unit 8
Our Blue Planet
Learning objectives
To understand and learn some new words, expressions and sentence patterns;
To understand and learn the usage of numbers;
To understand and learn imperative sentences;
To describe geographical phenomena through actual data;
To improve independent learning, cooperative learning and inquiry-based learning abilities.
Key points and difficult points
To learn and master the key new words, expressions and sentence patterns;
To learn and master the usage of numbers;
To learn and master the affirmative and negative forms of imperative sentences;
To describe geographical phenomena through actual data to enhance scientific literacy;
To struggle with complicated sentence structures;
To think critically and express opinions freely.
Leading in
01
Leading in
Listen to a song and guess what we are going to learn.
Leading in
Activity 1
02
Activity 1
Look at the picture. Guess what they are talking about.
Activity 1
What’s this
What does it say on the picture
It’s a poster about saving the ocean.
Pair work. Read the conversation. Pay attention to the imperative sentences.
Activity 1
Come in, please.
Miss Wang, here
is the poster about saving the ocean. Can I put it on this table
Oh, don’t put
it here. Please
put it on that
big chair.
Make a dialogue and practice in pairs.
Activity 1
Come _______, please.
Here is the poster about ___________. Can I ___________
Oh, don’t ______________. Please ______________.
Grammar
03
Grammar
祈使句
1. 概念
一般以动词原形开头，无时态和数的变化，没有主语，用来表示命令、建议、请求、禁止、警告、劝告等的句子。
命令：Close the door. 关门。
请求：Please help me. 请帮我。
建议：Let’s go for a walk. 我们去散步吧。
劝告：Don’t be late. 别迟到。
Grammar
2. 结构
（1）肯定形式
① Do 型：动词原形 (+宾语) + 其他.
Stand up. 起立。
② Be 型：Be + 表语 (名词/形容词) + 其他.
Be quiet! 安静！
③ Let 型：Let + 宾语 (人称代词宾格) + 动词原形 + 其他.
Let me help you. 让我来帮你。
Grammar
2. 结构
（2）否定形式
① Do 型和 Be 型祈使句的否定式均在句首加 Don’t；若句首有please，则在please 后加 don't
Don't fight. 不要打架。
Don’t play with fire. 不要玩火。
Don’t talk loudly. 不要大声讲话。
Please don't be late! 请不要迟到！
Grammar
2. 结构
（2）否定形式
② Let 型祈使句的否定式有两种：一种在 let 前加 Don't，另一种为“Let+宾语+not+动词原形+其他.”
Don't let him sing. / Let him not sing.
别让他唱歌。
Let him not stand in the rain.
不要让他站在雨中。
Grammar
2. 结构
（2）否定形式
③ No 开头，后跟动词-ing 形式来表示“禁止”的祈使句
No smoking! 禁止吸烟！
No parking! 禁止停车！
④ Never + 动词原形
Never come late. 永远不要迟到。
Never give up. 永不放弃。
Grammar
3. 注意
（1）有时为了表示委婉的语气，可在句首或句尾加please，但 please 加在句尾时，前面要用逗号隔开
Please sit down. 请坐。
Stand up, please. 请起立。
（2）在意思较为明显的情况下，可把谓语动词省去
This way, please.
请这边走。
Grammar
3. 注意
（3）有时为了明确地向对方提出请求或发出命令，可加称呼，但称呼要与句子隔开
Turn off the light, Jim.
吉姆，关灯。
（4）某些名词、形容词或副词等后面加感叹号，也可作为祈使句使用
Taxi! 出租车！
Activity 2
04
Complete the table and learn how to use imperative sentences.
Activity 2
Positive Negative
_______ every drop of water. Don’t _______ waste into the lake.
_______ enough water. _______ waste water.
Save water, save our planet! No _____________ in that lake.
_______ your step! The floor is wet. Never _______ the water running.
Let’s _______ a poster about saving water. Let’s not _______ here!
Don’t
Save
Drink
Mind
make
throw
swimming
keep
speak
Activity 2
Read the sentences and practice in pairs.
Save every drop of water.
Drink enough water.
Save water, save our planet!
Mind your step! The floor is wet.
Let’s make a poster about saving water.
Activity 2
Read the sentences and practice in pairs.
Don’t throw waste into the lake.
Don’t waste water.
No swimming in that lake.
Never keep the water running.
Let’s not speak here!
Activity 3
05
Match the pictures with the words or phrases, and then make imperative sentences.
Activity 3
take a shower
litter
swim
fish
collect
turn off
Match the pictures with the words or phrases, and then make imperative sentences.
Activity 3
Turn off the tap while brushing teeth.
Don’t litter around.
...
Vocabulary
06
Vocabulary
单词 词性 释义
knock v. 敲；击
n. 敲击声；敲门(或窗户)声
door n. 门
oh excl. 哦；啊；嘿
step n. 迈步；步骤；阶段
litter v. 乱扔
n. 垃圾
Language points
07
Language points
1. Xiao Ya is knocking on the door.
knock（1）动词，意为“敲；击”，常与介词 on/at 搭配。
knock on/at...意为“敲……”
He knocked three times and waited.
他敲了三下门就等着。
Listen! Someone is knocking on/at the window.
听！有人正在敲窗户。
I wish you wouldn't knock at the table again.
我希望你不要再敲桌子了。
Language points
1. Xiao Ya is knocking on the door.
knock（2）搭配 ① knock over 打翻；撞到
A push was enough to knock him over.
用力一推，足以把他撞倒。
Be careful no to knock over the flower vase.
小心不要把花瓶撞倒。
② knock into 撞上
If you knock into someone, you should say sorry to him.
如果你撞在某人身上，你应该对他说声“对不起”。
Language points
1. Xiao Ya is knocking on the door.
knock（3）可数名词，意为“敲击声；敲门(或窗等)声”
Late that evening, there was a knock at the door.
那天深夜，有人敲过门。
He got a nasty knock on the head.
他头部遭到重重一击。
Suddenly we heard a loud knocking sound from the engine.
突然我们听见引擎发出了响亮的敲击声。
Language points
2. Watch your step.
step（1）名词，意为“迈步；步骤；阶段；台阶”
He walks in a quick light step
他迈着轻快的步子走着。
Making a list of shopping is the first step to save money.
列购物清单是省钱的第一步。
（2）动词，意为“踩；踏；行走”
I'm sorry to step on your feet.
对不起踩到你的脚了。
Language points
3. Never keep the water running.
（1）never，副词，表示绝对否定，"绝不；永远不要"
Never leave your door unlocked at night.
晚上千万不要不锁门。
（2）keep，动词，此处表示"使维持某种状态"
Keep the window open for fresh air.
让窗户开着通风。
（3）keep sb. /sth. doing sth. 意为“让某人/某物一直做某事”
It's too cold. Keep the fire burning.
太冷了，让火一直燃着吧。
Language points
4. No littering.
（1）litter ① 动词，意为“乱扔”
Lots of books and newspapers litered the floor.
地板上乱七八糟地堆了许多书和报纸。
② 不可数名词，意为“(在公共场所乱扔的)垃圾，废弃物，杂物”
Don't throw litter on the ground.
别把垃圾扔在地上。
（2）No + 动名词，用于公共场所，表示禁止或警告某种行为
No parking here. 此处禁止停车。
No smoking. 禁止吸烟。
Exercise
08
Exercise
1. Let’s _________ basketball after school.
A. play B. to play C. playing D. plays
2. _________ me the truth, or I’ll be angry.
A. Telling B. To tell C. Tell D. Told
3. _________ late for school again, Tom.
A. Not be B. Don’t be C. Be not D. Aren’t
4. Please _________ the window before you leave the classroom.
A. closing B. to close C. close D. closed
A
C
B
C
Exercise
1. 请打开灯。
Please _____________ on the light.
2. 请小心！（Be+表语+其他）
_____________ careful, please!
3. 不要在图书馆里吃东西。（使用Don’t+肯定祈使句）
_______________ in the library.
4. 永远不要在不戴头盔的情况下骑自行车。（使用Never+动词原形）
_________________ a bike without wearing a helmet.
turn
Don’t eat
Be
Never ride
Exercise
1. You must be careful when you go across the street. (改为祈使句)
__________________ when you you go across the street.
2.You mustn’t play soccer on the street. (改为祈使句)
__________________ play soccer on the street.
3.You shouldn’t talk in class. (改为祈使句)
__________________ in class.
4.Can I help you with English (改为以 let 开头的祈使句)
__________________ help you with English.
Be careful
Don’t talk
Don’t play
Let me
Summary
09
Summary
Learn and master some new words, expressions and sentence patterns;
Understand and learn the usage of numbers;
Understand and learn the affirmative and negative forms of imperative sentences;
Describe geographical phenomena through actual data to enhance scientific literacy;
Think critically and express opinions freely.
Homework
10
Homework
Must-do: Review the key words, expressions, sentence patterns and grammar in today’s lesson.
Choose-to-do: Make a conversation with imperative sentences.
Thank you

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