Unit4: Environment
Topic: How to Preserve Environment
Mattayomsuksa 4
Structure
Present Perfect Passive
Subject + v. to have + been + verb 3
- The large areas of forest have been destroyed to make soya fields.
For example
- A house has been built by them.
- That temple has been visited by many tourists.
Active: I have written a story.
Passive: A story has been written
by me.
Active: I have not received a telegram.
Passive: A telegram has not been received by me.
Active: Have you kept the secret?
Passive: Has the secret been kept
by you?
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?
1 3 4 52
9876 10
Borrow mine
1._______ Rainforests are valuable habitats.
T / FTrue
2._______Eating a beef burger may be helping to protect the rainforest.
T / FFalse
3._______If you buy an orchid, check that it has been grown in Britain.
T / FTrue
4._______There are 45,000 species of plants live in the rainforests becoming extinct.
T / FFalse
5._______Some parrots and macaws are fortunately still imported.
T / FTrue
6._______Buying products made up of tropical hardwoods are protection the forests.
T / FFalse
7._______The tribal people of the forests have great knowledge of use the forest plants in medicines.
T / FTrue
8._______Rainforests provide us with oxygen and help to regulate the world' s climate and atmosphere.
T / FTrue
9._______The area of rainforest the size of Britain isn’t destroyed every year.
T / FFalse
10._______Before buying a burger, ask where the cattle came from and what they were fed on.
T / FTrue
1 2 3 4 5 6 7 8 9 10