Відповідь:

1. How many times have you read this book?

2. I have been writing the letter for 20 minutes, but I haven't finished it yet.

3. They have done their lessons and went for a walk.

4. He has been taking Enlgish lessons for 2 years.

5. Bob hasn't been to Lviv for 3 years.

6. It has been raining for 10 days.

7. How much milk has he bought?

Пояснення:

Не впевнена, але краще ніж нічого))