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Acid rain is caused (Present Simple Passive) by burning coal and oil. When either fuel is burned (Present Simple Passive), it releases poisonous gases which are carried up (Present Simple Passive) into the atmosphere and sometimes transported (Present Simple Passive) long distances.

Over 3,000 research projects have been carried out (Present Perfect Passive) to look into acid rain, and a decision to solve the problem has been taken (Present Perfect Passive) in most of the western European countries. Measures have been taken (Present Perfect Passive) in Scandinavia and in Central Europe to stop the pollution before it has destroyed the environment, and a diplomatic campaign has been launched (Present Perfect Passive) to convince other countries that the problem has to be considered as a major ecological threat.

“Five years ago this issue was not being treated (Past Continuous Passive) seriously,” says one leading environmental group, “but now that damage has been reported (Present Perfect Passive)  in large areas of forest and Lakeland, our politicians are being forced (Present Continuous Passive)  to take action. This problem must be solved (используется модальный глагол must) quickly: if governments do nothing, they will be faced (Future Simple Passive)  in two or three years’ time with accusation that they have allowed our forests to die.”

Our classroom is large and light. There are three large windows with pink curtains on them. The walls are pink too. The ceiling is white. The floor is brown.

Our classroom is decorated with flowers and pictures. There are flowers on the window-sills and on the walls. Some of the pictures are drawn by us at our Drawing lessons. Others are drawn by our parents.

In the right corner near the door there is a TV set, a record player, and a tape recorder. On the wall there is a blackboard. In the left corner there is a teacher’s table.

There is a large bookcase near the back wall of the classroom. There are a lot of books in it. In the low sections of the bookcase we keep our toys and games. When we stay in the classroom after classes we take them to play.