1. I have played the guitar since I was a child.(since my childhood).
2. My parents have lived in Bristol since April.
3. He hasn't worked for ten years since he had an accident.
4. I have had a dog for two years.
5. I have known Jack since October.
6. She hasn't played tennis since she was fifteen.
7. I have studied English for three years.
8. He hasn't seen Angie for five years.