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2.我们应该帮助挽救鲨鱼。
3.河流曾经是那么干净。.
4.空气遭到严重污染。
5.没有科学研究表明,鱼翅对健康有好处。
II. Grammar Focus
Read 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.
1. 现在进行时: Present Progressive
2. used to do与be used to doing
3. 被动语态:Passive voice
4. 现在完成时: Present Perfect
5. 情态动词
III. Practice
1. Work on 4a. Fill in the blanks with the correct forms of the verbs in brackets.
2. Work on 4b. Fill in the blanks with the appropriate modal verbs from the box.
3. Work on 4c. Make a list of things that people can do to help the environment and discuss your list with your partner.
4. Discussion.
A: I think that everyone should use public transportation.
B: I disagree. It’s difficult for parents with young children to use public transportation…
Homework
Finish the exercises in the workbook.