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Understanding some different tenses
Useful expressions: take public transportation, water pollution, land pollution, noise pollution, air pollution
[过程方法] According to finishing some tasks to train students’ integrating skills and train the ability of expressing students’ own opinions．
[情感态度] 1. We should form good habits． They are not only good for ourselves but also good for our society．
2. After learning this part, every student will be aware of the serious situation of pullution and determined to take action to protect our earth fron now on.
[教学重点]
1、能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
2、保护环境的措施方法。
[教学难点]
能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型
[教学策略]
根据本课教学目标和重点内容，教师可采用听，小组讨论，等活动来引导学生进行学习。
教学准备
ppt， mutiple-media
教学环节
Step 1 Lead-in
Listen to a tape about the beauty of nature. Compare the beautiful pictures with polluted pictures.
Step II. Grammar Focus
Show a composition according to grammar focus.
Pay attention to the sentences.
1) We’re trying to save the earth.2) The river used to be so clean.
3) The air is badly polluted.4) No scientific studies have shown that shark fins are good for health.
5) We should help save the sharks.
Step 3. Discuss the following tenses.
III. Practice
1. Work on 4a. Fill in the blanks with the correct forms of the verbs in brackets.
Joe: _____ you ever ______ (take) part in an environmental project ?
Eric: Yes, I have. I ______ (help) with a Clean-Up Day last year. It was _________ (consider) the biggest clean-up project this city ____ ever
____ (have).
Joe: How many people ____ (take) part?