资源简介

(共22张PPT)
Exploring the Topic
Grammar in Use
UNIT 3
Sound Body，Sound Mind
通过本节课的学习, 同学们将能：
1.理解构词法中否定前缀的构词原则。
2.准确理解并掌握“need to do” “don‘t need to do” “needn’t do”的用法区别。
3.熟练运用“need”进行症状描述、建议提出、疑问解答等。
学习目标
1. seem v.好像，似乎
2.unhealthy adj. 不健康的
3. empty adj.空的；无意义的
4.stomach n.胃
5.living n. 生活方式 adj. 活着的；生活的
6.clearly adv. 明显地；清楚地；清晰地
7.rid v.摆脱
8.sleepy adj. 困倦的，瞌睡的
9.worse adj. 更差的，更糟的；更坏的
10.fridge n.冰箱
11.weight n.重量
空的；无意义的___________________
胃_______________________________
好像，似乎_______________________
更差的，更糟的；更坏的___________
摆脱_____________________________
困倦的，瞌睡的___________________
不健康的_________________________
明显地；清楚地；清晰地___________
生活方式；活着的；生活的_________
冰箱_____________________________
重量_____________________________
Exercise:
unhealthy adj.
stomach n.
seem n.
worse adj.
rid v.
sleepy adj.
empty adj.
clearly adv.
living adj.
fridge n.
weight n.
（1）He became a non-smoker in order to keep healthy.
（2）Sea food may seem to disagree with some people.
（3）Hamburgers may taste delicious, but it is unhealthy to eat too many of them.
（4）It is incorrect to do sports with an empty stomach.
Grammar in Use
Activity 1
Look at the pictures and read the sentences. Pay attention to the words in bold.
Prefixes non-,did-, un-, mis-, in-, and im-
(1)The restaurant has a special area for smokers.
(2)My parents agree that getting enough sleep is important for our health.
(3)Eating fresh vegetables every day is important for our healthy.
(4)It is correct to wear a helmet when riding a bicycle.
Read the following sentences and finish the chart.
Affirmative form (肯定形式) smoker
Negative form (否定形式) Non-smoker
agree
disagree
healthy
unhealthy
correct
incorrect
常见的否定前缀有哪些：
-un-：unhappy（不开心的）、unfair（不公平的）、unable（不能的）、untrue（不真实的）
-in-：incorrect（不正确的）、inactive（不活跃的）、invisible（看不见的）、incomplete（不完整的）
-im-（常用于以m/p开头的词前）：impossible（不可能的）、impolite（不礼貌的）、immoral（不道德的）
-il-（常用于以l开头的词前）：illegal（非法的）、illogical（不合逻辑的）
-ir-（常用于以r开头的词前）：irregular（不规则的）、irresponsible（不负责任的）
-dis-：dislike（不喜欢）、disagree（不同意）、dishonest（不诚实的）、disappear（消失，即“不再出现”）
-non-：nonstop（不停的）、nonfiction（非虚构的）、nonverbal（非语言的）
词汇加上否定前缀，只改变词意，不改变词性。
Fill in the blanks with the correct form of the given words.
Activity 2
impossible
uncomfortable
dislikes
misplaces
nonstop
Activity 3
Read the text and fill in the blanks with the words in the box.
improper
uncomfortable
impatient
nonsense
【即时练】
(1) She became _____________ (happy) when she heard the bad news.
(2) It’s ___________ (polite) to shout at your parents.
(3) Some people ___________ (agree) with the plan, because it is not useful.
(4) That’s ___________ (sense)! No one can fly without wings.
unhappy
impolite
disagree
nonsense
Grammar in Use
need to do/don’t need to do/needn’t do
Activity 1
Pair work. Read the conversation. Pay attention to need.
What’s the matter with you
I stayed up to watch the soccer
game last night. I need to get
some sleep now.
You can watch the games online the next day. You needn’t stay up. You need to take care of yourself.
OK. Thank you for your advice.
Activity 2
Complete the table and learn how to use need.
to get
to take
do
情态动词 实义动词
形式 need（无人称变化） （1）
否定形式 （2） Don’t/doesn’t need to+n./
do sth
疑问形式 Need +主语+动词原形？ （3）
后接动词 to+ do(动词原形) 或sth
用法 多用于否定句和疑问句， 表示“必须，需要” 多用于肯定句
有人称和数的变化
needn’t do sth
Do /Does +主语+need...
动词原形
Summary
Read the sentences and circle the correct words.
Activity 3
√
√
√
√
√
Language points
1.He became a non-smoker in order to keep healthy.为了保持健康，他成了不抽烟的人。
【点拨】 （1）此句中，nonsmoker 为smoker 的否定形式, non为否定前缀。类似的否定前缀还有in-, im-, dis-, mis-, un-等。
（2）in order to do 意为“为了做某事”，相当于“to do”,比“to do”的语气更加正式。可以放句首，用逗号隔开，也可放在句中，不用逗号。
其否定形式为in order not to do...为了不做某事
（3）keep healthy 保持健康,此短语中，healthy为形容词。类似短语有stay healthy.
2.Sea food may disagree with some people.海鲜可能让一些人感到不适。
【点拨】disagree with sb表示“与某人意见不合”或表示“（食物、环境等）使某人不适”，此句中disagree with 为（食物、环境等）使某人不适。
3.It is incorrect to do sports with an empty stomach.空腹做运动是不正确的。
【点拨】 It is +adj.+ (for sb)+ to do sth 的句型较为常用，意为“对某人来说，做某事是……的”，用于描述某件事的性质或特点。
形容词还可以用以下一些词：easy/difficult/hard/important/necessary/possible/impossible等。
如：It‘s difficult for her to learn a new language.对她来说，学一门新语言很难。
4. An improper habit does a lot of harm to people.不良习惯对人危害很大。
【点拨】（1）此句中，improper为proper 的否定形式, im-为否定前缀。
(2)do harm to 对……有害。类似短语还有be bad for。
5.I stayed up to watch the soccer game last night. I need to get some sleep now.昨晚我熬夜看足球比赛了，现在需要补觉。
【点拨】 （1）stay up 意为“熬夜”
（2）此句中的need为实义动词，“need to do sth”意为需要做某事。
6.Kang kang needn't(do) the work today. He can hand it in tomorrow.康康今天不必做这项工作，他可以明天交。
【点拨】 （1）此句中的need为情态动词，否定形式为needn’t,后加动词原形。
(2) hand in + 名词（sth)意为“上交，提交”。
注意：名词作宾语可放中间或后面，代词作宾语必须放hand和in中间。如：hand in your homework = hand your homework in。
类似用法短语还有pick up, give up, put on, put up, turn off, turn down, take away等。
需要
当堂检测
一、选词填空
useful incorrect non-smoking misunderstand impossible
This is a ___________ area. Please don’t smoke here.
This problem is too hard for kids. It’s almost ___________ to solve.
Don’t _____________ me. I’m not criticizing you.
It’s ______________ to climb mountains in such weather.
Your answer is _____________. The right one should be option B.
non-smoking
impossible
misunderstand
unsafe
incorrect
二、翻译句子
(1)我们每天需要吃新鲜的蔬菜和水果。
We ___________ fresh vegetables and fruits every day.
(2)你不需要带太多现金，超市支持扫码支付。
You ____________________ too much cash. The supermarket accepts payment by scanning codes.
(3)他们不必今天就回复这个邮件。
They __________________________ this email today.
(4)小明需要在睡前完成他的数学作业 。
Xiaoming _______________ his math homework before going to bed.
(5)她不必早起，因为今天她休息。
She ___________________________ early because she’s resting today.
need to eat
don’t need to/needn’t take
don’t need to/needn’t reply to
need to finish
doesn’t need to/needn’t get up
THANKS
本课结束

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