1. Unit4: Environment
Topic: How to Preserve
Environment
Mattayomsuksa 4

3. Vocabulary

4. extinct

5. habitat

6. rainforest

7. timber

8. tribal

9. tropical

10. Structure
Present Perfect Passive
Subject + v. to have + been + verb 3

11. For example
- The large areas of forest have
been destroyed to make soya
fields.
- A house has been built by them.
- That temple has been visited by
many tourists.

12. Active: I have written a story.
Passive: A story has been written
by me.

13. Active: I have not received a
telegram.
Passive: A telegram has not been
received by me.

14. Active: Have you kept the secret?
Passive: Has the secret been kept
by you?

15. Changing active into passive
Active: She has done her work.
Passive: Her work has been done by
her.
Active: She has not cheated anybody.
Passive: Nobody has been cheated by
her.
Active: Why have you told a lie?
Passive: Why has a lie been told by
you?

16. Activity 1

17. Borrow mine
1 2 3 4 5
6 7 8 9 10

18. True
T/F
1._______ Rainforests are
valuable habitats.

19. False
2._______Eating a beef burger
T/F
may be helping to protect the
rainforest.

20. True
3._______If you buy an
T/F
orchid, check that it has been
grown in Britain.

21. False
4._______There are 45,000
T/F
species of plants live in the
rainforests becoming extinct.

22. True
5._______Some parrots and
T/F
macaws are fortunately still
imported.

23. False
6._______Buying products
T/F
made up of tropical hardwoods
are protection the forests.

24. True
7._______The tribal people of
T/F
the forests have great
knowledge of use the forest
plants in medicines.

25. True
8._______Rainforests provide
T/F
us with oxygen and help to
regulate the world' s climate
and atmosphere.

26. False
9._______The area of
T/F
rainforest the size of Britain
isn’t destroyed every year.

27. True
10._______Before buying a
T/F
burger, ask where the cattle
came from and what they were
fed on.

28. 1 point

29. 3 points

30. 5 points

31. 1 2 3 4 5 6 7 8 9 10