资源简介

(共33张PPT)
Unit 7 The secret of memory
主题范畴：人与自我；人与自然
主题群：生活与学习
子主题：自我认识，自我管理，自我提升；积极的学习体验，恰当的学习方法与策略，勤学善思；地球与宇宙探秘
Key question
What does it take to remember something
know more grammar rules of conditional sentences.
distinguish the differences between conditional sentences with if (... not) and unless.
use conditional sentences correctly.
Learning objectives 学习目标
After learning, I will be able to:
If you visit the park, you will have a lot of fun.
The if-clause to talks about _______________.
a probable action
The main clause talks about ______________.
the likely result
主
将
从
现
We have already learnt to use:
Lead-in
1. If I work hard this evening, I will complete my research.
2. If you are happy and you know it, then your face will show it.
3. If you are happy and you know it, clap your hands.
4. If you turn on the lamp, the room becomes bright.
5. If you take a fish out of water, it dies.
Pay attention to the sentences below.
句子结构：
从句部分: If +主语+ ____________
主句部分: 主语 + ___________/_______/___________
一般现在时
一般将来时
祈使句
一般现在时
Observe
A Conditional sentences (2)
We have already learnt to use conditional sentences to talk about probable results. We can also use conditional sentences to talk about results that will certainly happen.
我们已经学习了使用条件句来谈论可能的结果。我们也可以使用条件句来谈论一定会发生的结果。
Grammar
P105
While-learning
Read the passage below and pay attention to the words in bold.
We can also use:
主 现 从 现
When we use a conditional sentence to talk about something that will certainly happen, both verbs should be in the simple present.
Let’s sum up the rules!
P105
当我们用条件句谈论一定会发生的事情时，主句和从句中的动词都用一般现在时。
Summary: Conditional sentences (2)
一、结构
当表示条件和结果之间存在必然联系，即表示客观事实、结果时，if条件句 主句结构：_________________，
从句结构：__________________。
① If the temperature is below zero, water turns into ice.
如果温度低于零度，水就会变成冰。
② If you throw something into the air, it falls back to the ground.
如果你向空中抛东西，它就会回落到地面。
主语+一般现在时
If +主语+一般现在时
二、位置
* if 从句可以放在_________，也可以放在_________。
* 如果把 if 从句放在_________，常用_____将其与主句隔开。
Water turns into ice if the temperature is below zero.
主句之前
主句之前
主句之后
逗号
= If the temperature is below zero, water turns into ice.
Look!
If you put salt into water, it disappears.
= Salt disappears if you put it into water.
We can also put the if-clause after the main clause.
巧记绕口令
if 引导的条件状语从句歌
if条件句不一般， 几个要点记心间。
条件句放在前， 逗号要放句中间。
条件句表可能， 主句多用将来时；
条件句表事实， 主句常用现在时。
if条件句有特点， 现在时把将来替；
这个规则要牢记!
Read these if-clauses and match them with the results.
P105
Make conversations according to the sentences below.
1 S1: What happens if you switch off the lamp
S2: The room becomes dark.
S1: Are you sure
S2: Of course, I'm sure. If you switch off the
lamp, the room becomes dark.
2 S1: What happens if you put wood into water
S2: It floats.
S1: Are you sure
S2: Of course, I'm sure. If you put wood into
water, it floats.
Possible answers
3 S1: What happens if you water a plant
S2: It grows.
S1: Are you sure
S2: Of course, I'm sure. If you water a
plant, it grows.
4 S1: What happens if you drop a glass
S2: It breaks.
S1: Are you sure
S2: Of course, I'm sure. If you drop a glass,
it breaks.
B if ... not and unless
The word unless can mean if ... not.
unless 这个词的意思是 if ... not(如果不)。
Grammar
P106
Read the sentences below and pay attention to the words in bold.
一、含义及用法
* if ... not 意为“_______________”。
① If you do not get enough sleep every night, you will not remember things well.
如果你每晚睡眠不足，你就不会很好地记住事情。
② If you do not work hard, you will not succeed.
如果你不努力，你就不会成功。
如果……不……
Summary: if ... not and unless
* unless 意为“_____” ，用于引出某事发生或成立的必需条件。
① Unless get enough sleep every night, you will not remember things well.
除非你每晚睡眠充足，否则你不会把事情记得很清楚。
② Unless you work hard, you will not succeed.
除非你努力工作，否则你就不会成功。
除非
* unless引导的从句里通常用_______表将来。
现在时
= If you do not work hard, you will not succeed.
Unless you work hard, you will not succeed.
除非你努力工作，否则你就不会成功。
你能想到这个句子的其他表达方式吗？
如果你不努力，你就不会成功。
unless意为“除非”，和 if ... not (如果……不……) 的意思相近，且两个结构通常可以互换使用。
Look!
Unless you get enough sleep, you will not remember things well.
= You will not remember things well unless you get enough sleep.
We can also put the unless-clause after the main clause.
二、位置
Unless you leave now, you will be late for school.
= You will be late for school unless you leave now.
除非你早点出发，否则你上学会迟到。
unless从句可以放在________，也可以放在_________。
主句之前
主句之后
Su Wen is thinking about his weekend plans. Rewrite the sentences using unless.
(1) _____________________________________________
_____________________________________________
(2) _____________________________________________
_____________________________________________
(3) _____________________________________________
_____________________________________________
(4) _____________________________________________
_____________________________________________
Unless it rains, I’ll go for a picnic with my friends on Saturday.
I’m going to make a birthday card for my mother unless I have any better ideas.
I’ll finish reading Romance of the Three Kingdoms unless I’m too tired on Saturday evening.
I’ll help Su Mei practise English unless my mother’s birthday party ends too late.
Match the sentences below.
Interview your classmates about possible situations in life. You may add more questions to the list.
P106
What will happen if you don’t get enough sleep
What will you do if you can’t remember your password
What happens if you put some ice into a cup of hot water
What do dogs do if a stranger comes close
Post-learning
S1: What will happen if you don’t get enough sleep
S2: I will feel sleepy in class.
S1: What will you do if you can’t remember your password
S2: I usually write them down and put them in a familiar place.
S1: What do dogs do if a stranger comes close
S2: They tend to bark.
...
Possible answers
1. 当表示客观事实、结果时，if 条件句的主句和从句都用一般现在时，if 从句可以放在主句之前，也可以放在主句之后。
2. unless 意为“除非”，和if ... not (如果……不……) 的意思相近，且两个结构通常可以互换。
1. Let’s go out for a walk if you ______ free.
A. were B. will be C. are D. was
2. ______ you put the ice into the hot water, it melts soon.
A. Before B. Unless C. If D. Though
3. The family will visit the museum by bus if their car ______.
A. didn’t work B. doesn’t work
C. won’t work D. will work
一、单项选择。
4. Simon ______ glad if Tracy invites him to her new house.
A. will feel B. is feeling
C. has felt D. won't feel
5. We won't arrive in Nanjing before dark unless the plane ______ at 8 a.m.
A. will take off B. took off
C. takes off D. take off
1. If a fire ________ (starts/will start), we should call 119 for help.
2. You will get there on time ________ (if/unless) you take a taxi right now.
3. Unless we listen to the teacher carefully, we __________ (will know/won't know) what it talks about.
4. “I ___________ (send/will send) you a present if I tour around Spain,” Sandy said to Kate.
5. They will lose the game ________ (unless/if) they train hard.
二、从括号中选择适当的词或词组完成句子。
starts
if
won’t know
will send
unless
1. 除非我经常练习，否则我记不住这些单词。
　________ I practise often, I _________ _________ these words.
2. 如果你今天下午去市场的话，请给我买些鸡蛋。
Please ______ some eggs for me _____ you go to the market this afternoon.
三、根据所给汉语意思提示，完成下列句子。
Unless won’t remember
buy if
3. 除非电影有趣，否则迈克尔不会去电影院。Michael _________ _________ to the cinema unless the film _________ interesting.
4. 如果爱丽丝打算减肥，她应该多锻炼。
If Alice _________ to lose weight, she _________
_____ more exercise.
5. 如果你把一张纸放进火里，它会燃烧。
A piece of paper _________ _________ you
______ it into the fire.
won’t go
is
plans should take
burns if
put
Make some sentences about your daily life using if ( ... not) and unless. (at least 10).
Finish the exercises.
Preview Speaking on P107.
Thank you!

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