4. Sara is talking to her husband. They've been married for forty years. Six Past Simple verb forms should be Past Perfect. Find them and correct.
Sara: We first met in 1960, didn't we at the cinema?
Brian: Yes. When we arrived, the film already began.
Sara: I saw it before anyway.
Brian: Really? You didn't tell me that.
Sara: No. I wanted you to take me to the cinema the following week!
Brian: So you already decided you liked me!
Sara: And then you took me to your favourite restaurant, but it closed a week before!
Brian: Oh, dear. What did we do next?
Sara: We went to a pub to meet your friends, but it was empty. Everyone went home, because England was
playing Germany at Wembley.
Brian: What an evening!
Sara: That's not all! When I got home I couldn't open the front door because I left my keys at the pub.
2. If we dump all sorts of chemicals into rivers, we will not be able to swim in them in the future.
3. If we do not stop cutting down so many trees, we will endanger our oxygen supply.
4. Soon the Earth’s resources will be exhausted if the human population continues to grow.
5. If everybody continues to use aerosols and CFCs, the hole in the ozone layer will get bigger.
6. If the sun radiation can’t escape into space, Earth’s temperature will increase steadily.
7. If the global temperature rises, sea levels will rise too.
8. We’ll threaten our own existence if we do not cut down on waste rapidly.
9. People will run out of drinking water one day if they do not use it more rationally.
10. If he wants to help the planet, then he has to change his habits
2 His brother is a pupil. He is at school.
3 My parents are engineers. They are at work.
4 Is he a doctor? No, he isn't. He is a techear.
5 Is your sister a pupil? No, she isn't. She is an engineer. She is at work.
6 Her sister isn't a secretary. She is a teacher.
7 Are these doctors? No, they are pilots.
8 Is your sister at home? No, she isn't. She is at work.
9 Our father is a scientist.
10 His aunt isn't a doctor. She is an actress.
11 This is my book. It is on the table.
12 My cousin isn't a scientist. He is an engineer.
13 These are pictures. They are on the table. The pictures are very beautiful.
14 My granny is a pensioner. She doesn't work. She is at home.
15 Are your children at home? Yes, they are. They are pupils.