Have to - Positives, Negatives, and Questions
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Have to is a construction (structure). It is not a modal verb. We use auxiliary verbs do and does to form questions and negatives.
Examples:
Positive
I have to work very unsociable hours.
She has to wear a uniform.
Negative
I don't have to work at weekends.
John doesn't have to do any work at home.
Question
Do I have to pay in advance?
Does your father have to travel a lot at his job?
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Click on the links to do the exercise:
http://www.englisch-hilfen.de/en/exercises/tenses/do_not_have_to.htm
http://www.better-english.com/grammar/mustnt.htm
http://perso.wanadoo.es/autoenglish/gr.mustnt.i.htm
http://www.englishgrammarsecrets.com/musthaveto/menu.php
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