Ответ:
1)
1. I have written the letter yesterday.
2. He has done his exercises till six o'clock
3. Tamara has already cleaned the room
4. Petro opens the window, and it is very cold in the room.
5. Sveta went to the sea last summer.
6. I am doing my lessons now
2)
1. We go to school every day.
❓- Did we go to school every day?
❌- We don't go to school every day.
2. Roman is doing his homework now.
❓- Is Roman doing his homework now?
❌ - Roman doesn't his homework now.
3. Ann likes to travel by train.
❓- Did Ann likes to travel by train?
❌ - Ann don't likes to travel by train.
4. Oleg wrote the letter yesterday.
❓- Did Oleg wrote the letter yesterday?
❌ - Oleg don't wrote the letter yesterday.
5. I have not eaten yet.
❓ - Did I'm not eaten yet?
❌ - эт предложение само отрицательное
6. I am doing my lessons now.
❓- Did I'm doing my lessons now?
❌ - I am didn't doing my lessons now