The future of 'must'
Must is a modal verb and it does not have an infinitive form. The obligation to do something can (and frequently does) exist in the present. So we have to use an alternative way of expressing the idea in the future - will have to.
Look how to use 'will have to' to express obligation:
I will have to wait until Monday to go to the doctor.
You will have to learn more to pass the exam.
Now look at some examples of 'will have to' in the negative form:
The kids won't have to go to school tomorrow, it's a holiday!
He won't have to visit the doctor.
Questions & Answers
In questions 'will' goes before the subject:
- Will he travel to Germany again?
For short answers we use 'will' or 'won't' depending on whether the answer is positive or negative:
- Yes, I will / No, he won't.