1.a) I'm not allowed
b) I don't have the willing to do that
2.a)I am capable of doing this
b)I am allowed to
3.a) you are suposed to get a nice present
b) you are not allowed to buy an ugly present
4.a)Do I have permission
b) I have an emergency
5.a)I am allowed and i want to
b)it s possible that i come tomorrow