Объяснение:

Must

1.) My dad must still be at work;he leaves after 6.

2.) It must have been really hard for you to move to another country.

3.) You must apologise for the damage.

Have to

1.) My Biology teacher says that I have to study harder.

2.) Everyone has to wear a uniform in my school.

3.) Rachel has to learn Spanish cause she wants to go to university in Spain.

Should

1.) You should exercise everyday if you want to lose weight.

2.) Liam should visit cosmetologist about his acne problem.

3.) Your brother should treat his girlfriend better or she will leave him.