RG9u15
We’re trying to save the manatees !
Grammar
1.The past perfect tense:have/has +pp.
Eg:Some of the swamps have become polluted.
2.The passive voice.
Eg:In 1972,it was discovered that they were endangered.
3.”used to” +infinitive
Eg:There used to be a lot of manatees.
Function
Debate an issue
I think that animals should not live zoo.
I disagree with you. I feel that zoos provide clean and safe places for endangered animals to live.
用所给的词的适当形式填空:
1.The lion (keep) in tiny cages and can hardly move at all.
2.This kind of animals are in . They are .(dangerous)