Put the verbs in brackets into the correct tense.

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.

A: What 1) ….. (you / to do) when I 2) ….. (to call) at eight, Burt?

B: I 3) ….. (to work) in the garden because the wind 4) ….. (to blow down) the fence during the night.

A: Oh, 5) ….. (you / to manage) to fix it?

B: Yes, I ….. (to do ) it eventually, but it 7) ….. (to be) very hard work. I 8) ….. (to ask) my neighbor to help in the end. Why 9) ….. (you / to call) me?

A: I 10) ….. (to want) to tell you about the factory. It 11) ….. (to close down) yesterday.

B: I know. The company 12) ….. (to have) problems for a long time before they finally 13) ….. (to decide) to close down the factory.

A: I 14) ….. (to hope) they would change their minds about it, though. It 15) ….. (to be) a part of the town for years.

B: Well, at least everyone who worked there 16) ….. (now / to find) a new job. That’s good news.