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(共16张PPT)
Grammar in Use
Sound Body, Sound Mind
Unit 3
Learning aims
能正确使用need to do / don’t need to do / needn’t do
能正确使用否定前缀non-, dis-, un-, mis-, in- and im-
Lead in
What is it about
Activity 1
Know how to use prefixes non-, dis-, un-, mis-, in- and im-
Look at the pictures and read the sentences. Pay attention to the words in bold.
He became a non-smoker in order to keep healthy.
Sea food may seem to disagree with some people.
Look at the pictures and read the sentences. Pay attention to the words in bold.
Hamburgers may taste delicious, but it is unhealthy to eat too many of them.
It is incorrect to do sports with an empty stomach.
nonsmoker disagree unhealthy incorrect
non
dis
un
in
smoker
agree
healthy
correct
What word can you find in these words
We put “non-, dis-, un-, in-” in front of the words, these are called “prefix”.
Let’s learn
nonsmoker disagree unhealthy incorrect
The prefixes usually express the opposite meanings of the original words.
impossible
misplace
Let’s see more examples.
impossible
misplace
nonsmoker
disagree
unhealthy
incorrect
nonstop
nonsense
dislike
discover
disappear
unhappy
unlucky
uncomfortable
inexpensive
informal
impatient
impolite
misfortune
misunderstand
Exercise
Fill in the blanks with the correct form of the given words.
1. It is ___________ to keep healthy without good living habits.
2. Don’t eat too much junk food, or you will feel _______________.
3. She __________ ice cream because it’s bad for her teeth.
4. My sister’s room is tidy, and she never __________ her things.
5. We felt very tired after a long and ________ walk.
impossible
uncomfortable
dislikes
misplaces
nonstop
dislike uncomfortable impossible nonstop misplace
Read the text and fill in the blanks with the words in the box.
impatient nonsense uncomfortable improper
A(n) ____________ habit does a lot of harm to people. For example, staying up late is very bad for people’s health. Clearly, they will feel sleepy and _______________ the next day. What’s worse, people will become _____________ and they may even forget important dates. Sometimes, they will speak ___________ because their minds are not clear. To get rid of the habit, people need to sleep early and do some sports. A healthy body and a clear mind will make them feel good all day.
improper
uncomfortable
impatient
nonsense
Activity 2
Use need to do / don’t need to do / needn’t do correctly
Pair work. Read the conversation. Pay attention to need.
What’s the matter with you
You can watch the games online the next day. You needn’t stay up. You need to take care od yourself.
I stayed up to watch the soccer game last night. I need to get some sleep now.
OK. Thank you for your advice.
need为实义动词，表示需要，其后加不定式。有人称变化
肯定结构：need to do sth. 需要做某事
否定结构：don’t need to do sth.不需要做某事
need还可做情态动词，其后加动词原型,无人称变化
肯定结构：need do sth. 需要做某事
否定结构：needn’t do sth.不需要做某事
Complete the table and learn how to use need.
Need Example
need to do We need ________ (get) enough sleep every day.
don’t/doesn’t need to do The girls is getting well and she doesn’t need _______(take) the medicine now.
needn’t do Kangkang needn’t __________(do) the work today. He can hand it in tomorrow.
to get
to take
do
Read the sentences and circle the correct words.
1
2
3
4
5
He (need/ needs) to take a break now. He looks so tired.
We (need/ needn’t) to play sports every day to keep healthy.
You (needn’t/ don’t need) store so much food in the fridge.
You (needn’t/ don’t need) to worry about your grades. Just relax.
Both Maria and Meimei (need/ needn’t) to lose weight.
Exercise
Summary
◆否定前缀non-, dis-, un-, mis-, in- and im-
◆need to do / don’t need to do / needn’t do
Homework
1 Write down some words with prefixes non-, dis-, un-, mis-, in- and im-
2 Make at least five exclamatory sentences with need to do / don’t need to do / needn’t do each.

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