Respuesta:
4.-
a) must.
b)musn't
c)must
d)musn´t
e) must
f)musn't
g)musn't
h)must
i)musn't
j)must
5.-
a) must
b)musn't
c)musn't
d)must
e)must
f)musn't
6.-
1. should go to the doctor.
2. should go to study in an academy.
3. should be polite with people.
4. should Start to prepare the wedding.
