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八上英语人教
Unit 8
Let’s
Communicate ！
Let’s
Communicate ！
Section A How do we communicate
第三课时 3a-3c
01
02
03
04
教学目标
通过语法表格，引导学生逐步全面掌握零条件句和第一条件句；并且能够在语境中运用。
引导学生观察与翻译，培养其独立思考和发散性性思维，变被动学习为主动学习。
引导学生了解语法结构，在情境中运用结构。
能够根据学习目标和个人情况，选择适合的学习策略，如多观察，多反思；多记笔记，多背诵等。
If you feel sick, you should see a doctor.
If I don’t leave now, I won’t catch the bus.
If you work hard, you will succeed.
If you don’t hurry, you’ll miss the train.
If it snows, roads will freeze.
Read the sentences carefully.
If you want to solve the problem, a face-to-face talk usually works the best.
Texting can make things worse if you’re not careful with your words.
If the rehearsal ends at 7:00 p.m., I’ll pick up at 7:15 p.m.
If you stay calm and say sorry, it will help.
If I go there, I will try all the delicious local food.
3a
Read the sentences. Find more sentences with if -clauses in Section A.
What’s the similarity (相似性) of these sentences
if引导的条件状语从句
If you want to solve the problem, a face-to-face talk usually works the best.
Texting can make things worse if you’re not careful with your words.
If the rehearsal ends at 7:00 p.m., I’ll pick up at 7:15 p.m.
If you stay calm and say sorry, it will help.
If I go there, I will try all the delicious local food.
一般现在时
一般现在时
含有情态动词的一般现在时
一般现在时
一般现在时
一般将来时
一般现在时
一般将来时
一般现在时
一般将来时
What are the tenses of the main clause (主句) and the subordinate clause (从句)
条件状语从句的时态和主句的时态有何关系？
Discuss and say
什么是条件状语从句？
条件状语从句和主句的位置关系是怎样的？
条件状语从句可以和其他句式进行转换吗？
if引导的条件状语从句
在复合句中作条件状语的句子叫条件状语从句。条件状语从句常用if 来引导。
概 述
Let’s learn
if 引导的条件状语从句，既可放在主句前，也可放在主句后。位于主句前，要用逗号与主句隔开；位于主句后，其前不必用逗号。
◆ If you want to keep fit, you should exercise at least
thirty minutes a day.
如果你想保持健康，你每天至少应该锻炼三十分钟。
用逗号与主句隔开
位 置
在含有if 引导的条件状语从句的主从复合句中，当主句为下列情形之一时，条件状语从句要用一般现在时表达将来的含义。
（1）主句是一般将来时。
◆ If it’s sunny tomorrow, they will go camping.
如果明天是晴天，他们就去露营。
一般现在时
一般将来时
从句
主句
（主将从现）
时 态
高频考点
（2）主句是含有情态动词may, might, can, must, should
等的句子。
◆ If we start right away, we can finish the work on time.
一般现在时
情态动词
从句
主句
如果我们马上开始，就能按时完成这项工作。
（3）主句是祈使句。
◆ Work hard if you want to pass the exam.
祈使句
一般现在时
从句
主句
如果你想通过考试，就得努力学习。
Canyou give more examples
1. If she arrives late, we will start without her.
2. If the weather is bad, we can postpone the trip.
…
A. try texting.
B. I think we’ll understand each other better.
C. you can write things
down for him.
D. I’ll call you right away.
E. I’ll call a taxi for you.
F. Will you join me for
dinner
Match the two parts to make sentences.
3b
1. If we can have a face-to-face meeting,
2. If I have good news,
3. If you need to leave,
4. If you can finish your
work early today,
5. If the old man has
difficulties in hearing,
6. If you can’t reach him
by phone,
3c
Fill in the blanks with the correct forms of the verbs in brackets.
... If things ______ (go) well, we ______ (see) all those old faces again. Just think how great it will be! If you think you can come, _____ (drop) me a line and I ________ (give) you all the details about the reunion. But promise me you’ll think about it seriously.
go
will see
drop
will give
how引导的感叹句作think的宾语
Hey, it’s me. I wanted to talk to you about the training plan for our team. The new season is coming, so it’s time to make a plan for our training. If we _____ (start) earlier this year, I think we ___________ (perform) better. ______ (give) me a call and _____ (let) me know if you _____ (think) of a good time for everyone to meet. Talk to you soon!
start
will perform
Give
let
think
make a plan 制订计划
a good time (for sb) to do sth（某人）做某事的好时候
3c
Then discuss what the situations are and whom the information is for.
... If things ___ (go) well, we ______ (see) all those old faces again. Just think how great it will be! If you think you can come, ____ (drop) me a line and I _________ (give) you all the details about the reunion. But promise me you’ll think about it seriously.
go
will see
drop
will give
围绕聚会相关的假设交流
邀请参加聚会的对象
situation
whom
Hey, it’s me. I wanted to talk to you about the training plan for our team. The new season is coming, so it’s time to make a plan for our training. If we _____ (start) earlier this year, I think we ___________ (perform) better. _____ (give) me a call and ____ (let) me know if you _____ (think) of a good time for everyone to meet. Talk to you soon!
start
will perform
Give
let
think
团队训练计划的沟通
团队里一起参与训练计划讨论的成员
situation
whom
小组任务：
仿写2个if条件句，描述生活中的场景（e.g. 学习计划/朋友约定），并说明受众。
按要求完成句子，每空一词。
1. Study hard, and you will pass the exam.
（改为同义句）
_____ you study hard, you ____ pass the exam.
2. Without enough exercise, you will get fat.
（改为同义句）
_____ _______ ________ take enough exercise, you
will get fat.
If
will
If you don’t
Exercises
Exercises
Ⅰ. 翻译下列句子。
1.如果你不赶快走, 你就会迟到。
2.如果你爱你的父母, 你应当帮他们做做家务。
3. 如果你更友善一些, 你会交上很多好朋友。
If you don’t go soon, you’ll be late.
You should help do the housework if you love your parents.
You will make lots of friends if you are more friendly.
4. 如果你带外校的朋友来, 老师会让他们离开。
5. 如果你不完成作业, 妈妈不会让你玩电脑游戏。
6. 当你看到Bill Gates, 你会对他说些什么？
If you bring friends from other schools, the teacher will ask them to leave.
If you don’t finish your homework, your mother won’t let you play computer games.
What will you say to Bill Gates when you see him
Summary
结构：If + 一般现在时，主句 + will + 动词原形（或情态动词 /can/may/should 等）。
特点：表示主句动作发生所需条件的从句
时态：从句用一般现在时表将来，主句用 “will + 动词原形” 表将来的动作，遵循“主将从现”原则。
01
02
03
Homework
1. Review the new words and phrases.
2. Review the grammar knowledge of if -clauses.
3. Make up sentences by using if -clauses.

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