2. Unit 4 Our World Topic 1 Plants and animals are important for us. Section A

3. 单音节及部分双音节形容词比较级（ - er ）和最高级 （ - est ）的规则变化。 1 一般在词尾直接加 er/est: tall—taller—tallest 2 以 e 结尾的单词去 e 加 er/est: wide—wider—widest 3 以辅音字母加 y 结尾的单词，把 y 改成 i, 再加 er/est: busy—busier—busiest 4 以重读闭音节结尾，且末尾只有一个辅音字母的单 词，双写末尾的辅音字母，再加 er/est : big—bigger—biggest (fat, thin, red, hot)

4. 单音节及部分双音节形容词比较级（ - er ）和最高级 （ - est ）的规则变化。 Adjectivestrongtallnicebrave comparativestrongernicer superlativestrongestnicest Adjectivebigfatthinlazyugly comparativebiggerlazier superlativebiggestlaziest thinner thinnest uglier ugliest fatter taller tallest braver bravest fattest 2b Work alone 注意：最高级要在前面 +the

5. Animals

6. cowhorsehen

7. sheep some sheep

8. goose some geese

9. mouse some mice

10. small big The mice are smaller than the hens. The hens are smaller than the geese. The mice are the smallest of all. <<

11. > > The hens are bigger than the mice. The geese are bigger than the hens. The geese are the biggest of all. small big

12. thin a little The ducks are a little thinner than the geese. < much The ducks are much thinner than the pigs. < thin adj. 瘦的；薄的；稀的

13. Act as different animals on the farm to continue the conversation, using comparative and superlative degrees of adjectives in the table.

14. Look, listen and say

15. countryside city

16. countryside The air is fresh. The sky is blue. The trees are green. The river is clear. It’s quiet in the countryside.

17. The air is dirty. The river is dirty. city The buildings are tall. The roads are wide. The traffic is busy. It’s noisy in the city.

18. The air in the countryside is ______ The sky in the countryside is ______ The river in the countryside is ______ The trees in the countryside are _______ than those in the city. It’s ________ in the countryside than in the city. than that in the city. greener quieter fresher bluer clearer

19. 1a Look, listen and say Where does Wang Wei like to live better, a countryside or a city?

20. Listen and fill in the blanks with the correct words according to 1a. How does Wang Wei think of the countryside? What about Michael? Wang Wei goes there for his summer vacation every year. Wang Wei likes the countryside very much. He thinks the air is _________, the sky is _______ and there are also _________ trees and ________ rivers there. fresher bluer greenerclearer quieter Michael thinks it is __________, too. And people can enjoy _______ there. nature

21. 3

22. Thanks for listening!Thanks for listening! Goodbye!Goodbye!