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1. I’m tired, because I **have been working** very hard.
2. He **has been writing** letters all morning.
3. Catherina is getting fatter because she **has been eating** too much.
4. My mother **has been peeling** the potatoes all afternoon.
5. Cathy **has been attending** a cookery course since March.
6. How long **have** you **been learning** English?
7. Where are my eye-glasses? I **have been looking** for them for an hour.
8. Charles **has been escaping** from the police for years.
9. How long **have** you **been using** a computer?
10. Elizabeth **has been living** with Mike for three years.
11. She **has been earning** quite a lot of money for the last two years.
12. It **has been raining** for six hours.