Understanding the Usage of “Mustn’t” in English Rules and Examples

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Discover the rules for using “mustn’t” in English, including its definition and examples. Learn how to use “mustn’t” in a sentence and improve your language skills with 20 sample sentences.

Use Mustn't in a Sentence - How to use "Mustn't" in a sentence

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Definition of Mustn’t

“Mustn’t” is a contraction of “must not” and it is used to express prohibition or the necessity to avoid a particular action or behavior. It is a modal verb that is often used to indicate that something is forbidden or not allowed, or to emphasize the importance of following a particular rule or guideline. For example, “You mustn’t smoke in the building” means that it is not allowed to smoke inside the building, and “You mustn’t forget to submit your homework” means that it is important to remember to submit your homework.

How is “Mustn’t” used in English? What are the rules of use of “Mustn’t”?

“Mustn’t” is used in English to express a prohibition or a strong recommendation not to do something. Here are some of the rules for using “mustn’t”:

  1. Prohibition: “Mustn’t” is used to indicate that something is not allowed or forbidden. For example, “You mustn’t talk during the exam” means that it is not allowed to talk during the exam.
  2. Strong recommendation: “Mustn’t” can also be used to emphasize the importance of doing something or following a particular rule. For example, “You mustn’t forget to lock the door” means that it is important to remember to lock the door.
  3. Present tense: “Mustn’t” is used in the present tense to indicate a current prohibition or strong recommendation. For example, “You mustn’t use your phone while driving” means that it is currently not allowed to use your phone while driving.
  4. Contraction: “Mustn’t” is a contraction of “must not” and should be written as such. Avoid using “mustn’t” in its uncontracted form in formal writing.
  5. Negation: When using “mustn’t” to indicate a prohibition, the sentence should be in the negative form. For example, “You mustn’t drive over the speed limit” instead of “You must drive under the speed limit.”
  6. Certainty: “Mustn’t” is a strong word that indicates certainty. It should be used when the speaker is confident that the action should not be taken. For example, “You mustn’t eat that expired food” indicates a high level of certainty that the food should not be eaten.

Overall, “mustn’t” is a modal verb that is used to express a prohibition or strong recommendation. It should be used in the present tense, with proper contractions and negation, and with a high level of certainty.

How to use the word Mustn’t in a sentence?

Here are 20 sample sentences using “mustn’t”:

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  1. You mustn’t touch the hot stove.
  2. We mustn’t be late for the meeting.
  3. He mustn’t forget his passport for the trip.
  4. She mustn’t eat too much sugar.
  5. They mustn’t leave the house without permission.
  6. You mustn’t use your phone in class.
  7. We mustn’t waste any more time on this project.
  8. He mustn’t cheat on the exam.
  9. She mustn’t skip breakfast.
  10. They mustn’t ignore the safety rules.
  11. You mustn’t park in the disabled spot without a permit.
  12. We mustn’t forget to turn off the lights before leaving.
  13. He mustn’t smoke in the non-smoking area.
  14. She mustn’t play with the sharp objects.
  15. They mustn’t share their passwords with others.
  16. You mustn’t forget to RSVP to the party.
  17. We mustn’t exceed the budget for the project.
  18. He mustn’t use foul language in public.
  19. She mustn’t walk alone in the dark.
  20. They mustn’t disturb the neighbors with loud music.

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