These tasks can help you to practise The Past Perfect Tense (See Appendix 1 p. 224) and do the following exercises

15. Fill in the table with the forms of the following verbs:

to roll, to remove, to break, to heat, to twist, to bend, to pollute, to develop, to buy, to solve, to throw, to bring, to leave, to conduct, to build, to clean

Example: to draw

	Indefinite	Continuous	Perfect	Perfect Continuous
Present	draw	are drawing	have drawn	have been drawing
Past	drew	were drawing	had drawn	had been drawing
Future	will draw	will be drawing	will have drawn	will have been drawing

16. Underline the correct tense form in each of the following sentences.

1. People have always polluted / had always polluted their surroundings.

2. Before we came, they had discussed / were discussing the problems that threaten human life on Earth.

3. With the development of industrial cities, which put huge amounts of pollutants into small areas, the problem has become / had become urgent.

4. Our forests are disappearing / had disappeared because they are cut down or burnt.

5. She was relieved to hear that he had saved / saved those animals.

6. If nothing is done / had done about it, one day nothing will be able to live in the seas.

7. He said that he has developed / had developed new methods.

17. Put the verbs in brackets into Past Perfect or Past Simple.

1. We ….. (to have) a lot of trouble because we ….. (to lose) our passports.

2. She really….. (to like) him because he ….. (to help) her.

3. We ….. (to get) into the restaurant only because we ….. (to reserve) our places.

4. Chris ….. (to own) that car for 5 years before he ….. (to sell) it.

5. I ….. (to be) in Greece for 7 months before I ….. (to move) to Spain.

6. They ….. (to study) English before they ….. (to move) to Canada.

7. They ….. (to ride) their bikes before they ….. (to meet) their friends.