:Unit 13
We are trying to save the earth.
Section A Grammar Focus
Grammar Focus
We are try to save the earth. Present progressive
The river used to be so clean. used to
The air is badly polluted. Passive voice
No scientific studies have shown that sharks fins are good for health. Present perferct
We should save the sharks. Model verbs Fill in the blanks with the correct forms of the verbs in brackets.
