4.it's seven months since we started doing this research
2 song hye kyo last wrote to me one year ago
the last time song hye kyo wrote to me was one year
it's one year since song hye kyo last wrote to me
it's has been one year since song hye kyo last wrote to me
3 the last time he left his town was twelve years
it's twelve years since he left his town
he last left his town twelve years ago
4 I last saw my father one month ago
the last time I saw my father was one month
it is one month since I last saw my father
5 we haven't gone to the cinema for fifteen years
the last time we went to the cinema was fifteen years
6 we have not seen daniel since 1995
we last saw daniel was 1995
7 we haven't washed our car since monday
