(共31张PPT)
Module 5 Unit 3 Language in use (1)
外研版九年级上册
Learning objectives
1. Get the students to be able to use if clause
2. Learn to use if clause spontaneously and lively in their
speaking, reading, and writing.
3. Help ss distinguish the use of if in different clause.
Lead in
Watch the movie and answer the questions.
What signs we often see in the museums
What we are not allowed to do in the musems
ENTRANCE
EXIT
DANGER
BUSINESS HOURS
OFFICE HOURS
入口
出口
危险
营业时间
工作时间
Lead in
No talking! 禁止说话！
No photos! 禁止拍照！
No littering! 禁止乱扔垃圾！
No entry! 禁止入内！
No smoking. 禁止吸烟。
Keep off the grass. 请勿践踏草坪
Lead in
1. No shouting!
2. Don’t cross that rope!
3. Don’t be rude!
4. If you ever go to London, make sure you visit the Science Museum.
5. No entry.
6. No photos.
Observe the following examples carefully. They are all from this module.
Presentation
No shouting, please! 请勿喧哗!
No smoking. 禁止吸烟。
No + 动名词表示“禁止做某事”
e.g. No joking! 不要开玩笑！
No+动词-ing
Presentation
No + 名词表示“禁止做某事”
e.g. No photos. 请勿拍照。
No entry. 请勿入内。
No + 名词
Presentation
祈使句
祈使句用来表达叮嘱、劝告、希望、禁止、警告、请求或命令等。祈使句最常用来表达命令。
Go and wash your hands.
快去洗手。 （命令）
Be quiet, please.
请安静。 （请求）
Presentation
Be kind to our sister.
要对我们的妹妹友善。 （劝告）
Watch your steps.
走路小心。 （警告）
No littering.
不要乱扔垃圾。 （禁止）
Don’t forget to take an umbrella.
不要忘了带雨伞。 （叮嘱）
Presentation
祈使句的特点
(1) 祈使句一般没有主语，说话的对象都是第二人称“你”或“你们”，所以也可以理解为省略了主语you。祈使句末用句号或惊叹号，句子读时用降调。
(2) 以动词原形开头，无时态和数的变化。
(3) 祈使句的否定形式是在动词原形前加don’t。
(4) 在表达请求时，可以加上please; 表达比较强烈的语气时，可以用感叹号。
Please close the door.
Sit down, please.
Presentation
Come to my office. 到我办公室来。
Stop! 停！
Hurry up! 快点！
Please don’t do it. 请不要这么做。
Don’t be late again. 不要再迟到了。
Presentation
(5) Let’s 构成的祈使句往往用于提出建议。否定形式为：Let + 宾语 + not + 动词原形 + 其它成分。如：
Let’s go to school together.
Let him not go.
(6) 在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而使句子更简洁有力。如：
Just a minute, please!
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下面的口诀总结了祈使句的一般规律。一起来看看吧!
祈使句, 有特点,
动词原形摆在前,
否定句式也不难,
Don't 放在最前面,
其它一律都不变。
Presentation
if引导的状语从句。if引导的状语从句不是指已经发生的事件，而是指能够发生或可能发生的事件。
if从句+祈使句，相当于汉语的“如果……，就……”。
1. if从句的构成，例句：
If you want to go, please tell me.
if后面通常接一个完整的句子作从句。
状语从句
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2. if从句的位置
if引导的从句可以放在主句之前，也可以放在主句之后。例如：
If you ever go to London, make sure you visit the Science Museum.
如果你去伦敦，一定要去参观科学博物馆。可以改写为：
Make sure you visit the Science Museum if you ever go to London.
Presentation
3. if从句的用法
本模块主要学习并运用“if从句+祈使句”这种结构来表达建议。比如说，如果对方生病了，你建议他去看医生，就可以说：
If you do not feel well, please go to see the doctor.
你如果感觉不舒服，就去看医生吧。
Presentation
Let’s do
1.Match the signs with the rules.
1 No swimming.
2 No football.
3 No right turn.
4 No parking.
5 No littering.
6 No food and drinks.
Look at the signs and write the rules.
④
③
②
①
Do not touch.
No smoking.
No photos.
No entry.
Let’s do
3.Complete the sentences with the correct form of the words in brackets.
If you ______ (want) to see old machines, ____ (go) to the museum.
2. If you _____ (visit) London, _____ (take) a boat trip on the river.
3. If the computer does not _______ (start) immediately, ____ (wait) for one minute.
want
go
visit
take
start
wait
Let’s do
If the weather ____ (get) colder, ____ (put) on more warm clothes.
If any student _____ (have) a high fever, _____(send) him/her to the school doctor at once.
If you ____ (want) to know how it works, ____ (read) the book.
gets
put
has
send
want
read
Let’s do
4.Complete the sentences with your own ideas.
1. If you do not like the TV programme, __________________.
2. If you want to know where you are, ____________.
3. If you cannot arrive at the station on time, _____________
______________________.
4. If you need to seed an email, __________________________
__________________________.
If you want to join our team, practise more after class.
read a book instead
ask someone
friends and let the know
use the computer at the back of the classroom
call your
Let’s do
5.Work in pairs. Ask and answer questions about the museum.
Science and Technology Museum
Opening hours
9:00-17:00 Tuesday-Sunday
Charge
Free
What is on
Ground floor: Ancient Technology
First floor: Modern Technology
Second floor: Space Technology
Third floor: Medical Technology
Please note
No shouting.
No food.
No smoking.
No pets.
No littering.
Contact us
Information desk: 7323 8299
Email: information @
Let’s do
— What can you see at the museum
— You can see an exhibition about…
Now write some advice for visitors. Use If.
If you want to see ancient technology, go to the ground floor.
If you want to see modern technology, go to the first floor.
If you want to see space technology, go to the second floor.
If you want to see medical technology, go to the third floor.
Let’s do
1. _____________ ( not touch ) the machine. It’s too dangerous!
2. No _________ ( shout ), my child! This is a public place.
3. If you _____ ( want ) to know how it works, read the instructions.
4. If it ____________ ( not work ), _____ ( wait ) for a minute.
5. ______ ( turn ) off the radio if you _____ ( feel ) noisy.
Don’t touch
shouting
用所给词的适当形式填空
want
doesn’t work
wait
Turn
feel
Exercise
1. _____ wake up your sister, Ben. She needs a good sleep.
A. Don’t B. Doesn’t
C. Aren’t D. Can’t
2. We often see the sign “____” on the door of a switching room（配电室）.
A. No littering B. No entry
C. No swimming D. No parking
Exercise
A
B
3. —When is the school art festival
—It will be held on time if it _____ next Monday.
A. don’t rain B. won’t rain
C. doesn’t rain D. didn’t rain
4. —Sorry, I’m late.
—_____ tell me the bus broke down again!
A. Never to B. Not C. Don’t D. No
Exercise
C
C
Summary
1.“禁止做某事”的句型总结
1) No + v. -ing/ n.!
2) Don't + v.
3) mustn't + v.
4) can't + v.
5) You aren’t allowed to + v.
2. if引导的状语从句: if从句+祈使句
Homework
1. Review the grammar.
2. Finish the rest activities in the workbook.
谢谢
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