1、Do it yourself Period5一、【学习目标】1. 学会用否定前缀un-、in-、和im-构成反义形容词的方法。2. 学会使用含否定前缀un-、in-、和im-的形容词表达否定含义。二、【学习重难点】1. 如何在形容前添加un-、in-和im- 构成反义形容词。2. 如何使用否定前缀表达否定含义。三、【自主学习】写出下列形容词的反义词certain _ comfortable_important_ interesting_able_ fair _friendly _ happy _healthy _ kind _lucky _ pleasant _tidy _ usual _ac
2、tive_ correct_patient_ possible_complete_ direct_polite_ proper_四、【合作 探究】 Step 1 呈现1. 教师问：Is it healthy to eat much sugar ? No, its not healthy. / Its unhealthy.2. 向学生解释前缀 un- 的作用：un- = “not”. 接着介绍其他否定前缀 in- 和 im- : 例如： inactive; impossible.3. “头脑风暴法” 巩固单词： 把学生分成两人一组，其中一人读出课本上任意形容词， 另一人快速说出其反义词并拼写。例
3、如：一个学生说 correct, 另一个学生快速说出 incorrect.4. 教师引导学生归纳：(1) 在本课学习的否定前缀中， in- 从来都不会用在以字母l、r 开头的单词之前； (2) im- 一般用在以字母b、m 或p 开头的单词前，如： imperfect、impossible、impatient、improper.Step 2 操练1. 学生打开课本，翻到第51页，先读短对话，然后完成相关练习。2. 分别让四组学生朗读改正后的短对话，其他学生核对答案。核对完毕后让学生集体朗读所有对话。五、【达标巩固】 一、添加适当的前缀，写出下列形容词的反义词 1. certain_ 2. us
4、ual _ 3. active _ 4. patient _ 5. possible _ 6. fair _ 7. polite _ 8. happy _二、用所给单词的适当形式填空。1. You should not point at someone else. That is _(polite).2. I am sorry to say your answer is _(correct).3. It is _(friendly) to shut the door in ones face.4. _(healthy) food does harm to people.5. Ive got a
5、 headache, so I feel very _(comfortable) now.6. It is _(safe) to play with fire.7. I wont go to that meeting, because it is _(important) to me.8. It is _(possible) for him to do so many things within so little time.9. Dont be so _(patient). Wait here with me.10. That boy is too young, so he is _(abl
6、e) to know so many words.1. If you want keep fit, you should eat _(little) fast food than before.2. They love reading. They are _(read) of your magazine;3. Kitty enjoys cooking. She likes to cook _(taste) meals at weekends.4. People like going horse _(ride) in Inner Mongolia.5. There _(be) a lot of
7、traffic on the city roads, but it got better later.6. Our school football team played _(bad) yesterday and lost the final.7. I think his advice is _(use), I dont want to take it.8. At the _(begin), Mary didnt feel well.9. The Class1, Grade8 students _(plan) their class trip to the park now.10. During this _(year) Reading Week, I read the most books in my class.11. My story makes the little boy _(laugh) happily.12. In cooking lessons, I can learn how _(cook).13. Our school life is different from _(they).
