he has to cook supper.
........HE DOESN'T HAVE TO COOK SUPPER.........................................
they have to come to school on sunday.
...THEY DON'T HAVE TO COME TO SCHOOL ON SUNDAY
we have to work at night.
WE DON'T HAVE TO WORK AT NIGHT
she has to work by train.
...SHE DOESN'T HAVE TO WORK BY TRAIN.
i have to get up early at the weekend.
I DON'T HAVE TO GET UP EARLY AT THE WEEKEND