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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
1、现在进行时
2、used to句型
3、被动语态
4、现在完成时
5、情态动词。
现在进行时: Present Progressive
结构: be (am/is/are) + v.-ing
标志词：Look, Listen, now, right now…
e.g. Look! The boy is crying.
定义：表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段正在进行的动作。
What a fine day today!
Look! What are they doing?
用括号内所给动词的适当形式填空。
Listen! The phone __________(ring). Please go to answer it.
— Alan, it’s late. Why not go to bed?
— Jenny hasn’t come back yet. I
___________(wait) for her.
3. — What’s your father doing now?
— He __________ (write) a letter in the
study.