10/ It is monday since I last took a bath.

11 / She hasn't come back home for 4 years.

12. He has worked as a bank clerk for 3 months.

13. We have not flown to Singapore for 5 years.

14. I haven't had my hair cut since November.

15. We haven't called each other for 5 months.

16. We haven't met each other for a long time.

17. How long have you had it?

18. I have never had such a delicious meal.

=>
10. It is the first time I have taken a bath since Monday.
11. She hasn't come back to her hometown for 4 years.
12. He has worked as a bank clerk for 3 months.
13. We haven't flown to Singapore for 5 years.
14. I haven't had my hair cut since November.
15. We haven't called each other for 5 months.
16. We haven't met for a long time.
17. How long have you had it?
18. I have never had such a delicious meal before.