it is the first time he has told the true
he has worked here since 1998
we haven't bought it for 5 months
this is the first time he has taken the help
i started planting the trees for 3 hours
we haven't tried the food before
he began writing twenty years ago
he hasn't  met me for 10 years
it is 8 months since we have come to school
he hasn't visited me for 2 weeks