He doesn't have to cook supper. Perhaps someone else can cook, or they could order food instead.
They don't have to come to school on Sunday. Usually, schools are closed on weekends to give students and staff a break.
We don't have to work at night. Depending on the job, work hours can be flexible, or perhaps there's a shift system that allows us to work during the day instead.
She doesn't have to travel by train. There might be other modes of transportation available like buses, cars, or even biking, depending on the distance and convenience.
I don't have to get up early at the weekend. Weekends are typically for rest, so it’s possible to wake up later unless there’s a specific reason to do otherwise.