Jawaban:

1. Skiing equipment has been on sale since last summer.

2. They have played soccer for five years.

3. Has he done kitesurfing for more than a year?

4. Motocross has interested me since I was ten.

5. She has had few injuries since she started skiing.

6. Have you done extreme sports since you were a kid?

1. They have been skateboarding since three o'clock.

2. He has studiedEnglishfor two years.

3. I have known how to ride a bike since I was three.

4. They stopped doing extreme sports. They have not been kitesurfing since last July.

5. He has not gone skiing for several winters.