"Mustn't" is fairly common in British English, but pretty rare in American Answer from Crafty-Photograph-18 on reddit.com
mustn't
/ˈmʌsnt/
phrase
- must not; used to indicate that something is forbidden or, in a tag question, that something is not necessary.
Merriam-Webster
merriam-webster.com › dictionary › mustn't
MUSTN'T Definition & Meaning - Merriam-Webster
mustn't · ˈməs-ᵊnt · : must not · Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Cambridge Dictionary
dictionary.cambridge.org › us › dictionary › english › mustn-t
MUSTN'T | definition in the Cambridge English Dictionary
1 week ago - MUSTN'T meaning: 1. short form of must not: 2. short form of must not: . Learn more.
Reddit
reddit.com › r/englishlearning › mustn’t?
r/EnglishLearning on Reddit: mustn’t?
January 30, 2020 -
is “mustn’t” still in use? or is it already outdated? and can I do a question like “must I do something?”
Top answer 1 of 3
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I’d say it’s way less common than it used to be, but you still hear it sometimes. Not using the contraction or just replacing it with “can’t” or “shouldn’t” will sound more modern even if it means the meaning of “mustn’t” is more implied than said.
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In the US I only hear “must” or “must not” (never mustn’t) in the imperative sense very rarely (i.e. “You must do your homework”). It is more commonly used to suppose something (“It must be raining,” “He must be running late,” “They must not have finished their homework”). “Mustn’t” is almost unheard of; it sounds like an old Disney movie to me.
Videos
09:42
Must or Mustn't | English Grammar for Beginners: Using Modal Verbs ...
05:09
MUST and MUSTN'T (Beginner Level) - YouTube
00:52
How to Pronounce Mustn't - YouTube
00:56
'Mustn't' or 'don't have to': which one to use? 🤔 #learnenglish ...
Mustn't Correct Pronunciation
How to pronounce mustn't | British English and American ...
Wiktionary
en.wiktionary.org › wiki › mustn't
mustn't - Wiktionary, the free dictionary
“You mustn’t go” means you must stay, but “you needn’t go” means you do not have to go, with the implication that you still may if you wish.
Reddit
reddit.com › r/englishlearning › do you say 'mustn't' in conversational english?
r/EnglishLearning on Reddit: Do you say 'mustn't' in conversational English?
March 24, 2025 -
Hi, I'm learning English and I'd like to know if native speakers use 'mustn't' in conversational English.
If not, what do you say instead?
Thanks :D
Quora
englishforstudents.quora.com › What-is-the-difference-between-mustnt-and-dont-have-to
What is the difference between “mustn't” and “don't have to”? - English for Students - Quora
"Mustn't" is a contraction of "must not," and it is used to express that something is prohibited or forbidden. For example, "You mustn't smoke in this area" means that it is not allowed to s...
Japan Reference
jref.com › home › forum › 日本語 nihongo › 英語勉強フォーラム - learning english
Do Americans use "must" or "must not (mustn't)"? | Japan Reference
January 23, 2020 - Technically the sentence is correct but it's not current. We would say "don't open this box yet" or "you shouldn't open this box now" Then I ask: Oh, really? Thanks for the help､Jennifer.Is it that Americans never use "mustn't" or "must not"? She answered: We really don't use either.
EF English Live
englishlive.ef.com › en › blog › language-lab › english-grammar-use-must-mustnt
English Grammar: when to use ‘must’ and ‘mustn’t’ | EF English Live
The opposite is ‘must not’ or ‘mustn’t’. We use this to talk about thinks we need to avoid doing. For example ‘I mustn’t drink too much beer at this party’. In this sentence, we can see that I don’t think it is a good idea ...
Wordpress
clasejoseangel.files.wordpress.com › 2010 › 11 › must.pdf pdf
MUST, MUSTN'T, HAVE TO, DON'T HAVE TO
MUST, MUSTN’T, HAVE TO, DON’T HAVE TO · Complete these sentences with must, mustn’t or the correct or the correct · form of have to. 1.- At our school we __________ wear a uniform. 2.- You __________ cross the roads without looking. It’s · dangerous.
WordReference
forum.wordreference.com › english only › english only
can't or mustn't ? | WordReference Forums
December 27, 2006 - when I was younger decades ago, I was taught "can't" was the opposite of "must" when both expressed probability e.g. : Where's your mother ? - She must be home by now/ She can't be home yet. Now, we are told the opposite : "modern" grammars all insist "mustn't" must indeed be used Where's Mum ?
British Council
learnenglishkids.britishcouncil.org › grammar-vocabulary › grammar-practice › modals-must-mustnt
Modals - 'must' and 'mustn't' | LearnEnglish Kids
You must listen to the teacher. Mustn't means 'Don't do it!' If you do it, you will be in trouble.
Stack Exchange
ell.stackexchange.com › questions › 273894 › mustnt-vs-neednt
modal verbs - mustn't vs needn't - English Language Learners Stack Exchange
January 31, 2021 - How to distinguish use cases of these verbs? Mustn't is a negative form of modal verb. We should use when something prohibited. You mustn't talk in the library. Needn't it's regular verb with negat...
WordReference
forum.wordreference.com › english only › english only
"Mustn't" - Does anyone actually use this word? | WordReference Forums
December 26, 2006 - I think they were referring to Bush/Americans, even though they said 'English people'! ... mustn't have understood what we were saying. = I conclude that he didn't understand what we were saying. The "mustn't" here is "epistemic": that is, it relates to the speaker's view of the truth of the statement.
Wordpress
timetolearnesl.wordpress.com › 1st-eso › grammar-reference-1st-eso › must-and-mustnt
Must and mustn’t | Time to learn English!
May 15, 2020 - You must wear a seatbelt at all times. MUSTN'T The negative is Mustn't which refers to prohibition (negative obligation) Mustn't = Must not You mustn't use your smartphone while you are driving. You mustn't get on…
Andrew Guild
andrewguild.wordpress.com › 2023 › 09 › 14 › words-mustnt-musnt-musnt
Words: mustn’t, musn’t, mus’n’t
September 14, 2023 - The standard contraction of “must have” is “mustn’t”. mustn’t However, there is also an archaic version, “musn’t”. Wiktionary defines “musn’t” as a “Dated form of mustn’t.” A search of the Trove collection of historical ...
Collins Dictionary
collinsdictionary.com › us › dictionary › english › mustnt
MUSTN'T definition in American English | Collins English Dictionary
You mustn't tell anybody that we've gone.
WordWall
wordwall.net › en-gb › community › must-have-to-dont-have-to
Must have to dont have to - Teaching resources
must/have to/don't have to/mustn't - must/have to/don't have to/mustn't - have to/don't have to - Must / Have to / Should Questions
WordReference
wordreference.com › english-spanish dictionary › mustn't
mustn't - English-Spanish Dictionary - WordReference.com
mustn't - Translation to Spanish, pronunciation, and forum discussions
Kahoot!
create.kahoot.it › details › must-have-to-and-mustn-t-vs-don-t-have-to › 980f279e-2b7f-43c3-98e8-a9c1bbcc605a
MUST/ HAVE TO and MUSTN'T vs DON'T HAVE TO
Create interactive quizzes, polls, presentations, and more to engage your audience.
Quora
quora.com › What-is-the-difference-in-meaning-between-mustnt-and-cant
What is the difference in meaning between 'mustn't' and 'can't'? - Quora
Answer (1 of 11): In some sentences “mustn’t” and “can’t” mean the same thing. You mustn’t have understood the question = you can’t have understood the question. You mustn’t exit a taxi while it is moving = you can’t, when that is an instruction (though clearly you could actually do it).