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 he...

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.