Complete the sentences with the correct form of have to.
1. I ... learn English every day. I have problems with it.
2. My friends ... write a test. They are getting ready for it.
3. Alice ... phone her granny. She is ill.
4. He ... buy tickets for the bus.
5. They ... go by train every day. They live in the village and work in the city.
6. We ... speak French to our guest from France. He doesn't understand Russian.