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(共10张PPT)
Word power
Unit 4 Hands-on fun
One of the most common prefixes for adjectives is un-. It means “not”. We add it to some adjectives to give them the opposite meaning. We can also use some other prefixes, such as in- and im-, to form new adjectives with the opposite meaning.
lucky unlucky correct incorrect possible impossible
usual unusual complete incomplete polite impolite
A Add the correct prefixes to the words below so that they have the opposite meanings. You may use a dictionary to help you.
1 interesting _____________ 2 sure _____________
3 able _____________ 4 friendly _____________
5 active _____________ 6 patient _____________
7 expensive _____________ 8 perfect _____________
uninteresting
unsure
unable
unfriendly
inactive
impatient
inexpensive
imperfect
B Read the conversations below. Fill in the blanks with words in the box, adding the correct prefixes to them.
correct tidy usual possible patient
1 Simon: Do you spend much time doing DIY, Nora
Nora: Yes, I do! It’s ________ to find me without a DIY job to do. What about you
Simon: I’m not a fan of DIY because I’m too ___________.
Nora: Oh yes, it’s _________ to finish a DIY job if you are not patient.
~~~~~~~~~~~~~~
spend time (in) doing
花费时间做……
unusual
impatient
impossible
2 Mum: Suzy, your room is really ________—— things are all over the floor.
Suzy: Sorry, Mum. I‘ll tidy up soon. It seems some of the answers in my homework are _________ . I‘m looking for my textbooks to check.
untidy
correct tidy usual possible patient
incorrect
C Write about your and your friends’ DIY jobs, using the prefixes un- , in- and im- .
略
1 否定前缀un-
un- 加在形容词前，让词义变成“不……的”。happy →unhappy（不开心的）；fair → unfair（不公平的）；usual → unusual（不寻常的）。
探究 构词法
否定前缀un -, in - 和im -
2 否定前缀in-
in- 加在形容词前，也表示“不……的”。correct →incorrect（不正确的）；complete → incomplete（不完整的）；visible → invisible（看不见的）。
3 否定前缀im-
im- 常用于以“b” “m”或“p”开头的单词前。 patient → impatient（不耐烦的）；polite → impolite（不礼貌的）； possible → impossible（不可能的）。
学会运用1: The rainy day made everyone __________ (happy).
学会运用2: The toy car was ____________ (complete) — it had no wheels!
学会表达3: 满嘴食物说话不礼貌哦！
__________ __________ to talk with your mouth full of food!
unhappy
incomplete
It’s impolite

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