HAVE TO:
1- I have to go to school tomorrow
2- I have to clean my bedroom
3- I have to wash the dishes
4- I have to study for tomorrow's exam
5- I have to practice with my piano
MUST:
1- I must respect my parents
2- I must study hard
3- I must tell her the thruth
4- I must come there inmediately
5- We must buy a new house
SHOULD:
1- I should go to the doctor
2: You should help me, I cannot do it alone
3- I should apologize
4- I should tell him the thruth
5- He should broke up with his girlfriend