Unit 4 Hands-on fun Word power 课件2025-2026学年译林版（2024）英语八年级上册

Word power Unit 4 Hands-on fun 1 Learning aims 能掌握否定前缀un-, in-, im-的意义及构词规则 能正确使用含否定前缀un-, in-, im-的词 2 Lead in What’s it about? It talks about prefixes, which means “not”. Activity 1 Know the meanings of words with un-, in-, im- Look and say. lucky unlucky correct incorrect possible impossible usual unusual complete incomplete polite impolite 否定前缀: un-; in-; im- 5 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. 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）。 Activity 2 Use adjectives with un-, in-, im- correctly 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. unusual impatient impossible correct tidy usual possible patient 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 incorrect C Write about your and your friends’ DIY jobs, using the prefixes un- , in- and im- . My friends and I are DIY enthusiasts, though our projects are often imperfect. Sam built an unstable, uneven bookshelf from unsuitable wood. Jess painted a chair an uninspiring colour, leaving imprecise, uneven streaks and making it immobile. I was impatient while hanging a mirror, drilling an unfixable hole in the incorrect spot, leaving it inexplicably crooked. Our confidence remains unshakeable, but our skills are immeasurably bad. Summary 否定前缀un-, in- 和im- un- 加在形容词前，让词义变成“不……的” in- 加在形容词前，也表示“不……的” im- 常用于以“b” “m”或“p”开头的单词前 Exercise 用所给词的正确形式填空 1.Tom felt 　　　　 (sure) about his answer, so he didn’t raise his hand.   2.The old vase was 　　　　 (perfect), but the collector still liked it very much.   3.It’s 　　　　 (usual) to see snow in this city during summer.   4.The teacher never becomes 　　　　 (patient) when the students ask questions.   5.Although the shoes were 　　　　 (expensive), they were very comfortable.  unsure imperfect unusual impatient inexpensive 15 Homework 1. Try to introduce your DIY works with prefixes un-, in-, im-. 2. Preview the next period. 16 Lavf56.15.100 $