It's three years since I last took on an eco-tour. (not)

→ It's three years since I have not taken on an eco-tour.

The last time I went to Aonemall was two weeks ago. (haven't)

→ I haven't been to Aonemall for two weeks.

My family started living in Hue when I was 12. (since)

→ My family has lived in Hue since I was 12.

It's over a long time since he last attended a course on soft skills. (hasn't)

→ He hasn't attended a course on soft skills for a long time.

Mai last saw her brother when she left for Australia. (not)

→ Mai has not seen her brother since she left for Australia.

When did you learn English?

How long have you learned English?