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人教版八年级上册
SectionA
Grammar focus
Unit 8 Let’s Communicate!
Learning objectives
掌握 if 引导的条件状语从句的核心规则，包括从句与主句的位置关系和时态规律；能区分 if 引导的条件状语从句与宾语从句的含义、位置及时态差异；
能独立完成从句时态填空、句子匹配、句型转换等练习，准确运用 “主将从现” 等规则；能根据 “校园生活”“聚会邀请”“团队训练计划” 等场景，仿写或创编包含 if 条件状语从句的句子及简短语篇；能准确判断句子中 if 从句的类型，清晰阐述判断依据，提升语法应用的精准度。
能够根据文本形态及内容推断出与之相关的交流方式与交际情境，并在语境中正确运用条件句描述未来可能发生的事情。
Warming-up
Let’s enjoy a song.
If you're happy and you know it clap your hands
If you're happy and you know it clap your hands
If you're happy and you know it and you really want to show it
If you're happy and you know it clap your hands
If you're happy and you know it stamp your feet
If you're happy and you know it stamp your feet
If you're happy and you know it and you really want to show it
If you're happy and you know it stamp your feet
If you're happy and you know it shout “Hurray”
If you're happy and you know it shout “Hurray”
If you're happy and you know it and you really want to show it
If you're happy and you know it shout “Hurray”
Bill is crying. What will he do to become happy again
Guessing
game
If Bill is sad, he will listen to music to become happy again.
Guessing
game
If Bill is sad, he will play basketball to become happy again.
Bill is crying. What will he do to become happy again
Guessing
game
If Bill is sad, he will watch TV to become happy again.
Bill is crying. What will he do to become happy again
Guessing
game
If Bill is sad, he will enjoy delicious food with his friends to become happy again.
Bill is crying. What will he do to become happy again
If Bill is sad, he will listen to music to become happy again.
If Bill is sad, he will play basketball to become happy again.
If Bill is sad, he will watch TV to become happy again.
If Bill is sad, he will enjoy delicious food with his friends to become happy again.
Conditional
sentences
条件状语从句
If Bill is sad, he will listen to music to become happy again.
If Bill is sad, he will play basketball to become happy again.
If Bill is sad, he will watch TV to become happy again.
If Bill is sad, he will enjoy delicious food with his friends to become happy again.
条件状语从句表示在……条件下某事才能发生，从句是主句动作发生的前提或条件，通常由连词if引导，意为“如果”。
If Bill is sad, he will listen to music to become happy again.
If Bill get up late, he will miss the school bus.
Bill will listen to music to become happy again if he is sad.
Bill will miss the school bus if he get up late.
从句在前，
从句后要有逗号
主句在后
从句在后，主句在前，中间没有逗号
位置
用法
If引导的条件状语从句包含零条件句和第一条件句。
一般表示普遍存在的事实、真理或习惯行为。
条件成立时，结果必然出现，不存在任何不确定性。
零条件句：
第一条件句：
用于表示在特定条件下可能会发生的情况。
结果的实现是有条件的，且这个条件有实现的可能性。
Zero conditionals 零条件句
描述客观事实、自然规律、普遍真理或习惯性行为。
条件成立时，结果必然发生。
If + 一般现在时，主句 + 一般现在时。
e.g. If you heat water to 100°C, it boils.
如果你把水加热到100°C，它就会沸腾。
If the sun sets, it gets dark.
如果太阳落山，天就会变黑。
结构：
客观事实
自然规律
时态
时态
If you like sightseeing, you will love it!
If you walk along the Bund, you will see many old buildings.
主句用一般将来时，从句用一般现在时，即“主将从现”。
表示在特定条件下可能会发生的情况、结果或行为。
表达将来可能发生的条件和结果，结果发生的可能性较高。
First conditionals 第一条件句
If + 一般现在时，主句 + 一般将来时。
时态
You can also see famous buildings around it if you visit People's Square.
You should study hard if you want to make your dream come true.
主句用一般将来时，从句用情态动词，即“主情从现”。
If + 一般现在时，主句 +情态动词may, might, can, must, should等的句子。
时态
Have a rest
if you feel tired.
Please let me know if she comes back.
主句用一般将来时，从句用祈使句，
即“主祈从现”。
If + 一般现在时，主句 +祈使句。
归纳
条件
状语从句
用法
talk about possible actions and the results of these actions
位置
主句在前，从句在后，中间没有逗号。
从句在前，主句在后，中间有逗号。
时态
主将从现
主情从现
主祈从现
主现从现
Zero conditionals 零条件句
First conditionals 第一条件句
1. 借助“祈使句+and/or+句子（一般将来时）”句型来转换。
and 在句意上表示顺承，意为“那么，就”；
or 表示转折，意为“否则”。
e.g. If you get up early, you’ll catch the school bus.
= Get up early, and you’ll catch the school bus.
= Get up early, or you won’t catch the school bus.
早点起床，你就会赶上校车。
借助 without 或 with 来转换条件状语从句。
e.g. If there is no sunshine, plants will die.
=Plants will die without sunshine.
如果没有阳光，植物将会死亡。
If you help me, I’ll get better grades.
=With your help, I’ll get better grades.
如果你帮助我，我将取得更好的成绩。
36. If you are friendly to others, you ______make more friends.(青海省)
A. would B. could C. will
34. ---We will go for a picnic if it ______ this Sunday.(湖南-湘西)
---Sounds great.
A. won't rain B.is sunny C. will be sunny
18. If you study hard, you ________ into a good senior high school.(四川-广元)
A. got B. will get C. get
中考
真题
27. If the singer ______ to Zigong ______ September 20th, please call me. (四川-自贡)
A. will get; on B. gets; on C. gets; in
36. —Let’s go climbing if it __________this Saturday.
— Good idea. But nobody knows if it_____________. (湖北-咸宁)
A. is fine; rains B. is fine; will rain
C. will be fine; rains D. will be fine; will rain
中考
真题
Read the sentence.
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.
What’s the similarity (相似性) of these sentences
if引导的条件状语从句
if 引导的是从句
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.
What are the tenses of the main clause (主句) and the subordinate clause (从句)
一般现在时
一般现在时
一般现在时
含情态动词的一般现在时
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
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.
zero conditional sentence
零条件句
first conditional sentence
第一条件句
Find more sentences with if-clauses in Section A.
"If you can't meet, just call your friend."
"If it is still hard to talk, take a break."
"If you can come, I'll be very happy."
"If you want to make some new friends, this is a good chance."
"If you talk to ..., I think he / she will be happy to help you."
Match the two parts to make sentences.
1. If we 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
difficulty n. 困难；难题
have difficulty (in) doing sth. 做某事有困难 (介词in可以省略)
If the old man has difficulties in hearing, you can write things down for him.如果这位老人听力有困难，你可以把事情写下来给他看。
当表示做一件事的困难程度时，常作不可数名词，其前可用some，no等词修饰
当表示具体的困难、难处、难点时，作可数名词。
e.g. I have great difficulty with English grammar.
我在英语语法方面有很大困难。
Jack has a good memory. He has no difficulty (in)remembering these words.
Jack记忆力很好，他记这些单词毫不费力。
David can always face all kinds of difficulties.
David总是能够勇敢地面对各种困难。
Scan the passages and answer the questions.
What kind of texts are they
What forms of communication are they connected with
note
voice messages
Fill in the blanks with the correct forms of the verbs in brackets. 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 wee
drop
will give
situation
whom
Someone the speaker wants to invite to a reunion.
It's about a reunion. The speaker is inviting someone.
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
situation
whom
A member of the team (someone involved in the team's training plan).
It's about making a training plan for a team as the new season is coming.
Exercise
1. I think my mother ________ if she _______
free tomorrow.
A. will come; is B. comes; is
C. comes; will be D. will come; will be
2. If she likes it, she _______ it soon.
A. read B. reads
C. will read D. reading
I.单项选择题。
Exercises
Exercise
单击输入您的封面副标题
3. He will go out with you after he _______ his homework.
A. finishes B. will finish
C. is finishing D. finish
3.解析： 在after 引导的时间状语从句中，主句用一般将来时，从句用一般现在时表示将来；he为第三人称单数，故选A。
4. I will send you an e-mail as soon as I ______ in Canada.
　　A. arrive B. arrived
C. am arriving D. will arrive
4.【解析】本题考查状语从句的时态。当主句是将来时态时，状语从句用一般现在时来表将来，所以选择答案A。
Exercises
Exercise
单击输入您的封面副标题
II.用所给词的适当形式填空。
If he _______(come) to the party, he will have a good time.
We don’t know if it ________(rain) tomorrow; if it ________(rain), we ________(not go) out.
If it’s sunny tomorrow, Mary ___________(visit) the Great Wall.
If you _____(come) at 4:00 in the afternoon,
I _______________(begin) to be happy at 3:00.
comes
will rain
rains
won’t go
will visit
come
will/shall begin
shall多用于第一人称，单纯的表示将来，如I,we.
will多用于第二人称和第三人称；不过在交谈的过程中，will也可以用于第一人称，主要用于表达某种强烈的愿望。will做助动词时会构成将来式。
Exercises
Exercise
Exercise
III.同义句转换。
1. Hurry up, or you will not catch the bus.
_______ you ______ hurry up, you will not catch the bus.
2. Finish your homework now, and you can watch TV.
______ you ______ your homework right now, you ______ watch TV.
3. The fish may die without enough water.
_____the fish ______ have enough water, it ______die.
If don’t
If finish
can
If don’t
may
Exercises
IV.翻译句子。
1. 如果你想取得好成绩，你必须努力学习。
If you want to get good grades, you must study hard.
2. 世上无难事，只要肯登攀。
If you put your heart into it, nothing is impossible.
3. If winter comes, can spring be far behind
如果冬天来了，春天还会远吗？
Exercises
Homework
Read and recite Grammar Focus.
Practice making sentences using “if clauses”.
谢谢
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