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6. 对……有害
7. 在……顶部
8. 濒临灭绝
in southern China
be harmful to
at the top of
be endangered
1.我们正在努力拯救地球。
We’re trying to save the earth.
2.我们应该帮助挽救鲨鱼。
We should help save the sharks.
3.河流曾经是那么干净。
The river used to be so clean.
4.空气遭到严重污染。
The air is badly polluted.
5.没有科学研究表明,鱼翅对健康有好处。
No scientific studies have shown that shark fins are good for health.
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.
Present progressive
used to
Passive voice
Present perfect
Modal verbs
现在进行时: Present progressive
结构: be (am/is/are) + v.-ing