Choose the correct verb.if both variants are correct explain the difference in meaning. 1)some people have to/must work at night. 2)i watch tv all the time.i have to/must stop it. 3)fidans granny is ill.she has to/must visit her. 4)today is my little brothers birthday.i have to/must send him a card. 5)they have no english story books.thry have to/must go to the book shop. 6)elvin is so pale.he has to/must have some fresh air.