资源简介

(共20张PPT)
Grammar Focus-4c
Unit 9
It’s important to have good habits.
情 境 导 入
I think it’s important for teenagers to …
Presentation
观察下列句子的共同特点
1. To see is to believe .
2.To watch TV is boring .
3. I am surprised to watch him eat so quickly .
4.Edison’s mother taught him to read and write .
5. Don’t forget to wear a mask when you go out if you have caught a flu.
6.What I want is to learn from others.
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思考不定式所作句子成分
1. To see is to believe .
2.To watch TV is boring .
3. I am surprised to watch him eat so quickly .
4.Edison’s mother taught him to read and write .
5. Don’t forget to wear a mask when you go out if you have caught a flu.
6.What I want is to learn from others.
7.I want something to drink .
动词不定式（ Infinitive ）是动词的一种非谓语形式，没有人称和数的变化，不能单独作句子的谓语。其构成形式为“ to ＋动词原形”, to 为动词不定式的符号，本身无意义。不定式可以在句子中用作主语、表语、宾语、宾语补足语、定语、状语等。
主语
主语
状语
宾语补足语
宾语
表语
定语
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不定式作主语
不定式作句子主语，谓语动词应用第三人称单数形式。
To see is to believe .
To watch TV is boring .
不定式做主语常置于句末，而用 it 代替其做形式主语，避免句子头重脚轻
To do yoga (瑜伽)makes you healthier.
To watch TV is boring .
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不定式作宾语
We hope to get there before dark .
我们希望天黑前到达那儿。
拓展：常跟不定式作宾语的动词有 want , forget , refuse , need , try , learn , hope , wish , decide , begin , start 等。
决心 学会 有希望（ decide , learn , wish , hope )
同意 计划 主动干（ agree , plan , offer )
拒绝 要求 会失败（ refuse , demand , fail )
想要 设法 来帮忙（ want , manage , help )
请求 准备 负担起（ beg , prepare , afford )
答应 安排 来期待（ promise , arrange , expect )
以上后跟不定式，劝君牢记永不忘。
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不定式作宾语
注意：
当复合宾语中的宾语是动词不定式时，先用形式宾语 it 代替动词不定式把动词不定式置于宾语补足语之后，
即，主语＋动词＋ it ＋宾语补足语＋ to do sth.
We think it important to learn a foreign language well ．
我们认为学好一门外语很重要
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不定式作宾语
注意：
当复合宾语中的宾语是动词不定式时，先用形式宾语 it 代替动词不定式把动词不定式置于宾语补足语之后，
即，主语＋动词＋ it ＋宾语补足语＋ to do sth.
We think it important to learn a foreign language well ．
我们认为学好一门外语很重要
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不定式作表语
动词不定式常在连系动词 be 后作表语
The next step is to make sure that we have enough food.
下一步要确保我们有足做的食物。
e.g.
The most important thing is ________ (learn)something new and have fun.
to learn
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不定式作宾语补足语
不定式作句子宾语补足语，放在宾语后面。tell , ask , want , order , teach , invite , wish , get , help 等词后面常接不定式作宾语补足语。
即 v .+ sb . to do sth .
My parents will not allow me to play on the street．
我父母不允许我在街上玩耍。
e.g.My mother wants me ________ (do) the housework.
to do
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不定式作宾语补足语
拓展：后跟省略 to 的不定式作宾补的动词：
一“感”( feel )，二“听”( hear , listen to )，三“让”( make , let , have )，四“看”( watch , notice , see , observe ),“半”帮助（ help 后可省略 to ,也可带 to )。
e.g. Don ’ t make him________ (do) it if he doesn ’ t want to.
do
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不定式作定语
不定式作句子定语，放在被修饰的名词后，与被修饰的词语为逻辑上的主谓关系或动宾关系。
动词不定式在句中作定语，置于被修饰词之后。
Do you have anything to eat
He is not a man to tell a lie .
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不定式作定语
如果不定式的动词是不及物动词，其后要加上必要的介词或副词，构成的动词短语相当于及物动词。
e. g. He is not an easy man to get on with.
他是一个不好相处的人。
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不定式作状语
不定式作句子状语，表示目的、原因、结果等。
作结果状语，表示事先没有预料到，一般放在句子后面。
He hurried to the station only to find that the train had left．
他急忙赶到车站，却发现火车已经开走了。
I am surprised to watch him eat so quickly.【表示结果】
The room is large enough ______（hold） 1000 people .
to hold
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不定式作状语
作目的状语：
I come to see you .
He runs fast in order to get there in time .
We raised a lot of money to help the poor children .
注：此时不定式也可以放于句子前面。
Practice
4a Fill in the blanks with the words in the box.
to exercise not to give not to make
to have to go swimming to make
1. It ’s too cold for people______________ in winter.
2. The purpose of new technology is to make life easier,_______ _ it more difficult .
3. It ’s necessary for the old ________ every day .
4. ________ his grandparents happy, Tom visits them every week .
5. Teenagers want ________some time for themselves on weekends .
6. You can always ask your boss________ you too much pressure.
to go swimming
not to make
To make
to exercise
to have
not to give
Practice
4b Write sentences using the words given.
e. g. eat junk food / it / important / kids
It's important for kids not to eat junk food.
1. necessary / exercise more / the teenagers / it
______________________________________________________
2. decide / the boy / such loud music / listen
______________________________________________________
3. him / the good news / tell/ remember
______________________________________________________
4.Jane’ s friend / lose weight / every morning / run
______________________________________________________
5. a little kid / not easy / the math problem / it / work out
______________________________________________________
It’s necessary for the teenagers to exercise more.
The boy has decided not to listen to such loud music.
Remember to tell him the good news.
To lose weight, Jane’s friend runs every morning.
It’s not easy for a little kid to work out the math problem.
Production
What do you often do after school Do you think those activities are important Make a conversation according to the example.
watch TV
play sports
study harder
get enough sleep
A: Do you think it’s important to watch TV
B:Yes, I think we can learn a lot on TV.
C:But too much TV...
课 堂 小 结
Summary
It’s important to talk problems with someone.
It’s important not to play computer games too much.
In order to be hralthy, teenagers need to get enough sleep.
She is too young to make her own decisions.
Tell them not to meet strangers.
THANK YOU

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