Must:
'must + infinitive' (for something that's likely about the present) or
'must + have + past participle' (for something that's likely about the past):
http://www.perfect-english-grammar.com/modal-verbs-of-probability-exercise-1.html
Must/Have to:
http://www.englishpage.com/modals/interactivemodal2.htm
All modals:
http://www.englishpage.com/modals/interactivemodal1.htm
Extra activities...
Exercise 1) http://esl.fis.edu/grammar/rules/modal.htm
Exercise 2) http://www.autoenglish.org/gr.may.i.htm
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