Ответ:

1. I have known them for 10 years.
2. I've had this ring for 3 years already.
3. We have always wanted to visit the Athens, and now we're in this city.
4. I have always loved you, Alice, and I love you now.
5. We've had this farm for 15 years.
6. We have known this family since 1990.

1. I haven't talked to her for about a month.
2. We haven't been in London recently.
3. I have never spoken with her.
4. They have never travelled in the mountains.
5. We have never visited such places before.
6. I haven't seen Andrew recently, and I haven't heard anything about him yet.

1. For how long have you been here?
2. Has aunt Mary returned already?
3. Have you ever eaten sushi?
4. Have you already met my brother?
5. Have you seen Arthur today?
6. Have you made your report already?