. Tom has not had his hair cut for over 3 months

-> It's 3 month since Tom hair last cut.

2. My father hasn't been to Hanoi for 2 years

-> It's 2 years since my father went to Ha Noi.

3. I haven't enjoyed myself so much for years

-> It's many years since I last enjoyed myself.

4. I haven't eaten this kind of food for 2 years

-> It's 2 years since I ate this kind of food.

5. Mary hasn't rung for hours

-> It's many hours since Mary rang.

6. We haven't seen him for 4 years

-> It's 4 years since we saw him.

7. It's over a year since I last went to see them

-> I haven't gone to see them for a year.

8. It's more than ten years since I last played football