1/ The last time I cooked was 3 years ago.
 I haven’t cooked for 3 years
2/ When did you bought that bag?
How long have you bought that bag?
3/ I last saw him 2 days ago.
 I haven’t seen him for 2 days.
4/ I started writing blog 2 months ago
 I have written blog for 2 months.
5/ She began living in Danang when she was a child.
 She has lived in Danang since she was a child.
6/ It is 5 years since I last visit my grandparents.
 I haven't visited my grandparents for 5 years
7/ When did you start loving him?
How long have you loved him?
8/ The last time I went to bar was 6 years ago.
 I haven’t gone to bar for 6 years.