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1、Unit 4 Do it yourself,Study skills,Look and find the rule,un- + adjective,Prefix(前缀): A prefix is a group of letters that we add to the front of a word to form a new word. One of the common prefixes is un-. It means “not”.Can you think of more words starting with un-?,unable,unfriendly,unhappy,unhea
2、lthy,unlucky,unusual,unkind,untidy,We can also use some other prefixes such as in- and im-, to form new words with opposite meaning.,We have prefixes and we also have suffixes, such as -ful and -less. The suffixes changes a word into adjective and -less means “not”.,Conclusion,形容词的否定前缀主要有：-un, -im,
3、-in, -ir, -il, dis-等1. 大多数形容词的否定前缀都是-un，此时前面冠词是an，如：an unusual boy2. -im常加在以字母m, p, b开头的形容词之前，初中英语主要在字母p之前，如：polite-impolite3. -ir常加在以字母r开头的形容词之前，如：regular-irregular(不规则的)4. -il常加在以字母l开头的形容词之前，如：legal-illegal(非法的)5. -dis举例：honest-dishonest,Add the correct prefixes to some of the adjectives so that t
4、he sentences make sense.,1. Annie: Do you spend a lot of time doing outdoor sports? Simon: Sure. Its usual for me to stay at home all day.2. Sandy: Our neighbour next door is putting something on the wall. Mum: Its possible to sleep with all that noise.,unusual,impossible,3. Mille: Are you able to f
5、ix your bicycle, Andy? Andy: No. Im certain that I can fix it myself.4. Mum: Suzy, your room is really tidy-things are all over the floor. Suzy: Sorry, Mum. Ill tidy up right now.,uncertain,untidy,Useful phrases and expressions,1. do outdoor sports 做户外运动2. our neighbour next door 我们隔壁的邻居3. all over
6、the floor 遍地4. tidy up 整理，收拾5. right now 现在，马上,Exercises,1. Dont be _ (patient). He is only five years old. 2. Its _ (usual) for him to be rude. He is always polite. 3. Nicks room is really _ (tidy). His mother is angry with him. 4. Its hot today. I feel _ (comfortable).5. The dog was really _ (friendly) to me. It barked at me all the time.,impatient,unusual,untidy,uncomfortable,unfriendly,Thank you!,