1/ The last time I cooked was 3 years ago.

-> I haven’t cooked for 3 years

    The last time + S + V-ed + was + time + ago

=  S + have/has + not + VpII + for + time

2/ When did you buy that bag?

-> How long have you bought that bag?

     When did + S + V?

=  How long + have/has + S + VpII?

3/ I last saw him 2 days ago.

->  I haven’t seen him for 2 days.

   S + last + V-ed + time + ago

= S + have/has + not + VpII + for + time

4/ I started writing blog 2 months ago

-> I have written blog for 2 months.

   S + started/began + doing sth + time + ago

= S + have/has + VpII + for + time

5/ She began living in Danang when she was a child.

-> She has lived in Danang since she was a child.

    S + started/began + doing sth + when+S+was/were+...

= S + have/has + VpII + since + S+was/were+...

6/ It is 5 years since I last  visited my grandparents.

-> I haven’t visited my grandparents for 5 years.

   It is + time + since + S + (last) + V-ed

= S + have/has + not + VpII + for + time

7/ When did you start loving him?

-> How long have you loved him?

    When did + S + V?

=  How long + have/has + S + VpII?

8/ The last time I went to bar was 6 years ago.

-> I haven’t gone to bar for 6 years.

    The last time + S + V-ed + was + time + ago

=  S + have/has + not + VpII + for + time

9/ It’s years since she wrote to me.

-> She hasn’t written to me for years.

   It is + time + since + S + (last) + V-ed

= S + have/has + not + VpII + for + time

10/ I last took a bath 2 days ago.

-> I haven’t taken a bath for 2 days.

   S + last + V-ed + time + ago

= S + have/has + not + VpII + for + time

`1)` I haven’t cooked for 3 years

`2)` How long have you bought that bag?

`3)` I haven’t seen him for 2 days.

`4)` I have written blog for 2 months.

`5)` She has lived in Danang since she was a child.

`6)` I haven’t visited my grandparents for 5 years.

`7)` How long have you loved him?

`8)`  I haven’t gone to bar for 6 years.

`9)` She hasn’t written to me for years.

`10)` I haven’t taken a bath for 2 days.