John must / had to study a lot last week for his exams.
had to
When I was little I could / couldn´t swim, but now I can.
couldn´t
You should / don´t have to clean your shoes before you go. They´re really dirty
should
When my grandpa was young, children mustn´t / didn´t have to stay at school until they were 18
didn´t have to
Seatbelts are necessary for drivers and passengers. Drivers and passengers_________ seatbelts.
must wear / have to wear / need to wear
You don´t have to / mustn´t talk on the phone while driving.
mustn´t
We´re not allowed to use our phones in class. We _________ use our phones in class.
mustn´t
It´s a good idea to check your work for mistakes. You ________ check your work for mistakes
should / ought to
You shouldn´t / mustn´t run in the hall. It´s not allowed.
mustn´t
Last week I must / had to / have to practice the piano everyday.
had to
Grandpa´s mum gave him pocket money which he had to / could spend as he liked.
could
Lucy mustn´t / doesn´t have to get up early on Sundays.
doesn´t have to
I don´t understand the maths homework. I have to / should ask the teacher for help.
should
I´m ill so I can´t will / won´t be able to go to your party.
won´t be able to
After practicing for months I was finally able to / finally could do the skateboard trick.
was finally able to
Kids could / must leave school when they were 14.
could
I can wear any clothes I want to school. I _________ wear a uniform to school.
don´t have to / don´t need to
Grandpa failed the medical examination, so he mustn´t / couldn´t join the army.
couldn´t
Alice don´t have to / doesn´t have to go to school at the weekend.
doesn´t have to