13 : The last time we saw the film was 10 years ago.
=> We haven't seen the film for 10 years.

14 : it's two months since we last saw a movie.
=> We haven't seen a movie for two months.

15 : it's two months since he earned some money.
=> He hasn't earned some money for two months.

16 : I last drank champagne at my brother's wedding.
=> I haven't drunk since at my brother's wedding.

13 : The last time we saw the film was 10 years ago.
=> We haven't seen the film for 10 years.

14 : it's two months since we last saw a movie.
=> We haven't seen a movie for two months.

15 : it's two months since he earned some money.
=> He hasn't earned some money for two months.

16 : I last drank champagne at my brother's wedding.
=> I haven't drunk since at my brother's wedding.