1) This is the first time he went abroad .

→ He hasn't gone abroad before .

2) She started driving 1 month ago .

→ She has driven for 1 month .

3) We began eating when it started to rain.

→ We have eaten since it started to rain .

4) I last had my hair cut when I left her.

→ I haven't my hair cut since I left her .

5) The last time she met me was 5 months ago.

→ She hasn't met me for 5 months .
 

6) It is a long time since we last met.
=> We have not met for a long time
7) When did you have it ?
=> How long have you had it?

8) This is the first time I had such a delicious meal .
=> I have not had a such delicious meal before
9) I have not seen him for 8 days.
=> The last time I saw him was 8 days ago
10) I have not taken a bath since Monday for two months
=> It is two months since I last took a bath