3. Use for or since. 6. I've been a teacher __________ 1990 7. She' been waiting __________ a long time but nobody came. 8. Grandma has been very happy __________ she moved in with us two 9. I have lived in this town __________ three years. 10. Mary has known Paul __________ they were in High School together.

Ответ:

• 6. I've been a teacher since 1990 (since + дата)
• 7. She' been waiting for a long time but nobody came (for + период времени)
• 8. Grandma has been very happy since she moved in with us two (since + момент времени)
• 9. I have lived in this town for three years (for + период времени)
• 10. Mary has known Paul since they were in High School together (since + момент времени)