Use modal auxiliary verbs can, may, must in positive or negative forms (can't, mustn't, needn't).
Good morning, Madam. ___ help you?
Can I help you?
I'll take care of her. You ___ worry.
You need not worry.
► BACK to online Can, may, must exercises with answers and grammar rules.
For beginners - pre-intermediate learners of English as a foreign language.