1.my father hasn't been to vung tau for 2 years
2.betty has not ridden to work for a fortnight
3.the last time he played tennis was in 1990
4.the last time i met her was 2 months
5.tom has been playing tennis for 4 years
6.i have been cooking for the party for 4 hours
7.my father has been reading a newspaper for 2 hours
8.my sister has been studying english for a year
9.she has been working as a secretary for 2 years
10. when did you started studing english
11.how long have you begun to do research on lung cancer
12.this is the first time my father has driven a car
13.it's the first time i have met such a famous singer
14.it's the first time she has been to the ballet
15. this is the first time she has drunk coca cola