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3. 1. Mary has been learning English since the second form.
2. Nick has been trying to solve this problem for a week.
3. I have been facing a real challenge for the Last three years.
4. Have you been working in the garden? Your clothes are so dirty!
5. Has Susan been sleeping badly? She looks worn out.
6. How long have his parents been calling you?
7. The children have been swimming for twenty minutes.
8. I have been eating fish for a long time.
4. 1. Granny has been cooking chocolate pie in the morning.
2. George has been illustrating story on Thursday.
3. My parents have been discussing winter holidays since September.
4. Ann has been listening to this group since childhood.
5. John has been driving car five years.
6. The children have been walking in the forest in the morning.