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Definition of "must" []

  • To be obliged or required by morality, law, or custom: Citizens must register in order to vote. (auxiliary-verb)
  • To be compelled, as by a physical necessity or requirement: Plants must have oxygen in order to live. (auxiliary-verb)
  • Used to express a command or admonition: You must not go there alone. You simply must be careful. (auxiliary-verb)
  • To be determined to; have as a fixed resolve: If you must leave, do it quietly. (auxiliary-verb)
  • Used to indicate inevitability or certainty: We all must die. (auxiliary-verb)
  • Used as an auxiliary to express obligation or compulsion: you must pay your dues. In this sense, must does not form a negative. If used with a negative infinitive it indicates obligatory prohibition (verb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • Used as an auxiliary to indicate necessity (verb)
  • Used as an auxiliary to indicate the probable correctness of a statement (verb)
  • Used as an auxiliary to indicate inevitability (verb)
  • On the part of the speaker when used with I or we (verb)
  • On the part of another or others as imputed to them by the speaker, when used with you, he, she, they, etc (verb)
  • Used as an auxiliary to express conviction or certainty on the part of the speaker (verb)
  • Used with an implied verb of motion to express compelling haste (verb)
  • An essential or necessary thing (noun)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

Use "must" in a sentence
  • "August 1, 2009 at 1:36 pm must resist……………..must………….resist."
  • "I must say, though, that most everyone around here is looking at me like we *must* be since I quit my job, all our friends are preggers or have babies and it's been two years of marriage..."
  • "You thunk it so it must be…….must be…..must be…WHAT?"