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The meaning of must is be commanded or requested to. How to use must in a sentence. You must pay your dues. Used as an auxiliary to express obligation or compulsion: Must is a modal verb. When youre taking kayaking lessons, a lifejacket is a must. It is followed by the base form of a verb. In this sense, must does not form a negative. You use must to indicate that you think it is very important or necessary for … A must is something thats so important it cant be missed or ignored. We usually use must to talk about obligations which come from the speaker and we generally use have (got) to when we refer to obligations …