The Fifth Period－Section B(3a－3b) & Self Check
Teaching Important Points 【教学重点】
Key words & phrases：
need to be improved，cause the problem，is getting worse and worse
Key sentences：
1.The river used to be so clean.
2.We have seen many changes in the environment.
3.People should take public transportation more.
4.The river is polluted by factories.
5.The air pollution is getting worse and worse.
Key structure：
Review present progressive，modal verbs，passive voice，used to，present perfect tense
Teaching Difficult Points 【教学难点】
★Use the words and structures to write a letter to the city mayor about the environmental problems and give suggestions.
Teaching Aids 【教学工具】
CAI，pictures or multimedia courseware.
Teaching Steps 【教学过程】
★Step 1 Leading in 【新课导入】
1．Greeting
2．Discuss what we should do and what the government and organizations need to do about the environment.
★Step 2 Cooperative inquiry 【合作探究】
1．Finish the task in 3a
①Show a few pictures about the neighborhood.Talk freely with the students.
Where is this？Is it a nice place？Why or why not？What are the problems?
②Read the instructions in 3a.Discuss the questions in group.Each express his/her opinion.Then finish the task.
③Ask some students to report their discussion.
2．Finish the task in 3b
①Read the instructions.Show the writing points on the board.Learn how to finish the letter.
②Write the letters on their own.
③Exchange their writing work with each other.They can learn from each other and help each other.
④Check their work with the whole class.Get three students to read aloud their letters.
3．Finish the tasks in Self Check
Activity 1
①Read the demand and know what to do.Students finish the task on their own.
②Students discuss the word formation.
③Check the work with each other.Learn the words and the prefixes and suffixes.Think of more words.
