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(共15张PPT)
UNIT 8 Let’s communicate!
第3课时
（Section A GF 3a-3c）
Enjoy a song
什么是条件状语从句？
什么叫条件？如果.....(发生某件事)，那么....(就会发生另外的一件事)
2
Presentation
Part 2. Read the sentences.
3a
Find the similarities(相似性) of these sentences.
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 you 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.
if 条件句，
if 引导的是从句
结构、
1.If+从句，主句。
2.主句+if 从句。
2
Presentation
Part 3. Read the sentences. Find more sentences with if-clauses in Section A.
3a
What are the tenses of the main clause(主句) and the subordinate clause(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 you 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.
if 引导的是从句
一般现在时
一般将来时
一般现在时
含情态动词的一般现在时
zero conditional sentence
零条件句
first conditional sentence
第一条件句
一般将来时
一般将来时
1.零条件句
Zero conditionals 零条件句，指表达客观真理（如科学事实）或习惯性动作的句型。
eg. If you water to 100C, it .
如果你把水加热到100度，水就会沸腾。
If the sun , it dark.
如果太阳下山了， 天就会变黑。
heat boils
sets gets
if+一般现在时，主句+一般现在时
1.第一条件句
First conditionals 第一条件句，用于描述将来可能发生的情况。
eg. (1)If it sunny tomorrow, they camping。
is will go
1.if+一般现在时，主句+一般将来时,"主将从现"
如果明天是晴天，他们就去露营。
（2）主句是含有情态动词 must,can, may, might, should
could，would等的句子。
◆ If we right away, we 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。
start can
1.if+一般现在时，主句+情态动词,"主情从现"
（3）主句是祈使句。
◆ if you 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。
Work hard want
1.if+一般现在时，主句用祈使句,"主祁从现"
3b
Match the two parts to make sentences.
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 her
by phone,
A. try texting.
B. 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
join sb for sth 与某人一起做某事；参与或加入某人的行列中一起做某事
have difficulties (in) doing sth 做某事有困难
right away 立即；马上
write down 写下；记下
B
D
E
F
C
A
if 从句
主句
try to do sth努力做某事
try doing sth 尝试做某事
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
if引导的条件状语从句
表示条件或前提的从句叫作条件状语从句。连词if的意思是“如果”,它引导的句子表示某事发生所需要的条件，即“在……条件下某事才能发生”,在句子中充当状语，因此我们称之为if引导的条件状语从句。
概 述
Let's learn more
1.I don't know if he will come.
if 在宾语从句中,意为“是否”。
（1）if not意为“如果不”,可以与unless“除非”进行转换。If not=unless.If=as long as
If you don't get up early,you will be late.
句型转换
高频考点
=You will be late unless you get up early.
=You won't late as long as you get up early.
（2）if引导的条件状语从句时，可转换成“祈使句+and/or+句子”。and：顺承，or:否则.
1.If you stay calm, it will help.
2.If you don't follow me, you will get lost.
句型转换
=Stay calm, and it will help.
=Follow me, or you will get lost.
（3）借助“with/without来转换条件状语从句。
If you help me, I will solve the problem。
句型转换
=With your help, I'll solve the problem.

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