I must paperwork
I must give it a name
I must vaccinate
I must´nt mistreat my pet
I must´nt train my dog

You mustn't forget your appointent at 3 o'clock.


You must remember that we've got an apointment at 3 oc'clock



It must be raining.


It mustn't smoke at school



You must stop drinking.

You mustnt  drinking this water.



You must be hungry

You mustn't go against go against your parents' wishes.



You must play the piano on a daily basis

Your mustn't play the piano beyond 8 p.m.