16) This is the first time he went abroad .

→ He hasn't gone abroad before .

17) She started driving 1 month ago .

→ She has driven for 1 month .

`18) We began eating when it started to rain.

→ We have eaten since it started to rain .

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

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

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

→ She hasn't met me for 5 months .