Unit 3 The environment and us Lesson 18 课件

课件18张PPT。UNIT 3 LESSON 18 Reuse and Recycle形容词比较级的用法形容词比较级是什么？ 为了表现不同程度的性质，形容词具有三级：原级、比较级、最高级。形容词的比较级变化规则变化：短字+er
more +长字
不规则变化：需靠背诵
good / well →better
規則变化 1. 形容词字尾加ertall ?taller
I am tall.My father is taller.fast ?faster
The bike is fast.The train is faster.2. 形容词字尾是e者则加r nice ? nicer safe? safer cute ? cuter3. 形容词字尾是子音加y则去y加ierThey are happy.Tina is happier.happy ?happierDad is busy.Mom is busier.busy ?busier4. 形容词是发短母音则重复字尾加erhot ?hotterYesterday was hot.Today is hotter.
big ?biggerThe hippo is big.The elephant is bigger.
5. 多音节形容词在前面加moreinteresting ?more interesting beautiful ? more beautifulhandsome ? more handsome形容词比较级不规则变化good ?betterbad ? worsemany? more看句型 学造句
(2):主词1+ be +比较级+than +主词2+be (1):主词+ be + 比较级I am taller.You are tall.I am taller than you are.The train is faster.The bike is fast.The train is faster than the bike is.Peggy is happier.They are happy.Peggy is happier than they are.I am better.Mary is good.I am better than Mary is.