资源简介

(共14张PPT)
人教版英语八年级上册
Unit 8 Let’s Communicate!
Section A How do we communicate
Grammar Focus (3a-3c)
新课讲授
3a
Read the sentences. Find more sentences with if-clauses in Section A.读句子。在a部分找出更多含有if从句的句子。
lf 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.
These “if...will” sentences are called The First Conditional.
新课讲授
3a
Read the sentences. Find more sentences with if-clauses in Section A.读句子。在a部分找出更多含有if从句的句子。
如果你想解决问题，面对面交谈通常效果最佳。
如果你措辞不细心，发短信可能会使情况更糟。
如果排练晚上7:00结束，我会在晚上7:15去接你。
如果你保持冷静并道歉，这会有帮助。
如果我去那里，我会品尝所有的当地美食。
We'll finish at 7:00 p.m. if it's on time.
More Sentences
If everything goes well, I'll see you at 7:15.
If the traffic is too bad, you'll have to wait for a few minutes.
If I visit China this year, I will go to the park with you.
If you can’t meet, just call your friend.
If it is still hard to talk, take a break.
Think and Share
What tense is used after “if”
What tense is used in the other part of the sentence
What does the “if” clause show
What does the other part of the sentence show
The simple present tense.
The simple future tense or the modal verbs.
It shows possible situations or introduces a condition for something to happen.
It shows the possible results.
知识点讲解
if 引导的条件状语从句由 “if + 从句，主句” 构成。
1. 基本结构
例如：If you want to solve the problem, a face-to-face talk usually works the best.（如果你想解决问题，面对面交谈通常是最好的方式。）
其中，“If you want to solve the problem” 是条件状语从句，“a face-to-face talk usually works the best” 是主句 。
知识点讲解
在 if 引导的条件状语从句中，当主句描述将来的情况时，主句用一般将来时（will + 动词原形），从句用一般现在时表示将来。
2.时态搭配（主将从现原则）
例如：If it doesn’t rain tomorrow, we will go for a picnic.
（如果明天不下雨，我们就去野餐。）
“If it doesn’t rain tomorrow” 是从句，用一般现在时；
“we will go for a picnic” 是主句，用一般将来时 。
知识点讲解
当主句是祈使句或含有情态动词(如 can、may、 must 等)时，从句仍然用一般现在时。
3.特殊情况
例如：If you need help, call me.
（如果你需要帮助，打电话给我。）
主句是祈使句，从句用一般现在时；If you can finish your work early today, you can go home.（如果你今天能早点完成工作，你就可以回家。）主句含有情态动词 can，从句用一般现在时 。
知识点讲解
注意事项
1.if 从句位置
if引导的条件状语从句可以放在主句前，也可以放在主句后。当 if 从句在主句前时，从句后要用逗号与主句隔开；当 if 从句在主句后时，不用逗号隔开。
例如：If you stay calm and say sorry, it will help.
　 = It will help if you stay calm and say sorry.
（如果你保持冷静并道歉，这会有帮助。）
知识点讲解
注意事项
2.与其他引导词引导的状语从句区别
if 引导的条件状语从句与 when 引导的时间状语从句在用法上有相似之处，但 when 强调时间点或时间段，而if 强调条件。
例如：When I grow up, I will be a teacher.
（当我长大后，我会成为一名教师。）强调时间；
If I study hard, I will pass the exam.
（如果我努力学习，我会通过考试。）强调条件 。
知识点讲解
注意: 宾语从句中的if与条件状语从句if的区别。
宾语从句中的if “是否”相当于whether, 引导宾语从句, 时态需根据语境确定。
I don’t know if it will rain tomorrow.
我不知道明天是否会下雨。
新课讲授
3b
Match the two parts to make sentences.将这两部分配对造句。
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
B
D
E
F
C
A
新课讲授
3b
Match the two parts to make sentences.将这两部分配对造句。
1.如果我们进行一次面对面的会议，
2.如果我有好消息，
3.如果你需要离开，
4.如果今天你能提前完成工作，
5.如果这位老人听力有困难，
6.如果你无法通过电话联系到他，
A. 试试发短信。
B. 我认为我们会更好地理解彼此。
C. 你可以为他把事情写下来。
D. 我会立刻给你打电话。
E. 我会为你叫一辆出租车。
F. 你愿意和我共进晚餐吗？
新课讲授
3c
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.用括号中动词的正确形式填空。然后讨论
是什么情况，信息是给谁的。
go
will see
drop
will give
It’s a note.
It’s about a planned reunion. The speaker is excited to see old friends again and is inviting someone to come.
It's probably for an old friend or acquaintance(熟人) who might be invited to the reunion.
新课讲授
start
will perform
Give
let
think
It’s a voice message.
It's about making a training plan for a team because the new season is coming. The speaker wants to fix up a time for everyone to meet.
It's for team members involved in the training, perhaps those who play a part in planning or taking part in it.

展开更多......

收起↑