扬中市外国语中学

学习目标： 1. 学习用否定前缀反义形容词的的 方法 2. 学会使用含否定前缀的形容词表 达否定含义

Let's guess first!

sparrow

golden eagle

swallow

seagull

crane

swan

A: Which bird do you like best? B: I like … best. A: Why? B: Because …

Look! She is smiling. She is h______. appy But now she is crying. She is ___happy. un

He is clapping his hands. That means you are w_______. elcome unwelcome They are good friends. They are f________ to each other. riendly unfriendly welcome friendly

Negative （否定的） welcome happy friendly necessary important common comfortable able unwelcome prefix( 前缀 ) Positive ( 肯定的 ) unnecessary unimportant uncommon uncomfortable unable un- add unhappy unfriendly With some adjectives, we can change the meaning by adding a prefix. Adding the prefixes to an adjective will express the opposite meaning of the word. The prefixes mean “not” or “the opposite of”.

More prefixes such as (1) 一般以 c 开头的形容词用前缀 in- 构成反义词 correct incorrect (2) 一般以 p 开头的形容词用前缀 im- 构成反义词 possible impossible polite impolite (3) 一般以 r 开头的形容词用前缀 ir- 构成反义词 regular irregular (4) 有些形容词用前缀 dis- 构成反义词 honest dishonest agreeable disagreeable

1.necessary uncomfortable 2.important irregular 3.comfortable dishonest 4.honest unhappy 5.regular unnecessary 6.happy unimportant Match the following words with their opposite meanings on the right.

7. welcome impossible 8. correct unfriendly 9. common unwelcome 10.friendly unable 11.possible incorrect 12.able uncommon

1.Zhalong is a nature area. It is __________ to hunt or fish there. 2.When you go birdwatching, you sometimes have to walk a long way. If you wear new leather shoes, they can be _________________. 3.If you are interested in birds, you can go to Zhalong. But if you leave litter there, you will be ______________. 4.There are not many red- crowned cranes in the world. They are ____________. 5.If we do not protect the wetlands, it will be ____________ to see these birds in the future. incorrect uncomfortable unwelcome uncommon impossible It's time for you to finish the sentences!

healthy lucky tiring usual tidy clean clear pleasant easy unhealthy unlucky impolite incorrect impatient irregular polite patient possible regular honest correct active expensive untiring unusual untidy unclean unclear dishonest unpleasant uneasy impossible inexpensive inactive

(useful, useless ) Playing football is _________. Just waiting is ________. useless useful (popular, unpopular ) Some books and new stars are Very________, and many people like them. But some are not, they are ____________. unpopular popular

(important, unimportant ) I like sports. I think sports are _____________, but Jim thinks it is____________. unimportant important (interesting, boring ) A: Is the boy interesting? B: Yes, he is______________. A: But I think he is not interesting, he is __________. boring interesting

1.Some people are _________ ( friendly, unfriendly) to birds. They throw stones to them. 2. Some people feel ________ (happy, unhappy) that the government gives poor people such small and _____________ (comfortable, uncomfortable) flats. unfriendly unhappy uncomfortable 选词填空 :

3. It is ______ (safe, unsafe) to walk on the street at night. 4. We should keep students staying away from the ________ (healthy, unhealthy) books. unsafe unhealthy

1.This is a ‘No Parking’ area. It is __________(correct) to park cars here. 2.This chair is too small. It is ____________________ (comfortable) to sit in it. 3.The boy didn’t tell the truth. He is ___________(honest). 4.The restaurant is quite near here. It is ______________ (necessary) to take a taxi. 5.I don’t like him because he is rude. He is ___________ (friendly) to others. 6.I have never seen such heavy snow here. It is _________ (common) to see such heavy snow here. 7.Water is very important to us. It is ___________(possible) for us to live without water. incorrect uncomfortable dishonest unnecessary unfriendly uncommon impossible

necessary welcome happy regular honest comfortable important possible friendly common correct able safe expensive healthy “dis-”“un-”“in-”“ir-”“im-” popular polite

1.manners n. 礼貌，风度 (good manners) 上课听讲是礼貌的。 It’s______ ________ _____ ______ ______teachers in class. 他是一个很有礼貌的发明家 He’s ______ _______ ______ _______ __________. 2.leave 把 …… 留下；遗忘 使 …… 处于（状态中） 今天早上他把表忘在火车上了 He _______his watch _______the train this morning. good manners to listen to an inventor with good manners left on

不要把孩子单独留在房间里。 ______ ________the child ______himself. 3.litter un 垃圾；废弃物 过去街道上满是乱扔的垃圾 The streets______ _____ ________ _______in the past. Don’t leave by were full of litter

反思与心得

复习当日所学内容 复习当日所学内容 完成教学案《课后作业》. 完成教学案《课后作业》.