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ESL forum > Grammar and Linguistics > can ´t vs mustn ´t for prohibition    

can ´t vs mustn ´t for prohibition



NanG
Argentina

can ´t vs mustn ´t for prohibition
 
Dear All !

I ´m in doubt. 

What is the difference between can ´t and mustn ´t for prohibition?

Thanks a lot in advance!

24 Jun 2012      





jkcm25
Korea, South

You use "Can ´t" when it is not possible to do it; Often use colloquially, and sometimes it ´s a question of ability.  For instance, I can ´t run that far.
You use "Mustn ´t" when it ´s an imperative not to do it (an order). For instance, you mustn ´t text while driving otherwise you will get a ticket.  

24 Jun 2012     



cacucacu
Argentina

Hi Nan!
When I was at the teacher trainning college my friends and I used a rather useful way of remembering: can ´t we associated with "inside"= It ´s you who decide, you are the judge, while musn ´t we associated with "outside"=somebody else decides for you, somebody else is the judge.
I hope this explanation works for you too.
Love,
Naty

24 Jun 2012     



NanG
Argentina

24 Jun 2012     



douglas
United States

can ´t = you are unable to do it
mustn ´t = you are not allowed to (or shouldn ´t) do it

25 Jun 2012     



yanogator
United States

Good answers so far, but I need to add something.
 
We also use "you can ´t" when referring to things that are illegal, or otherwise against the rules.
 
You can ´t smoke in restaurants in most of the US.
The sign says that you can ´t park here.
You can ´t wear flip-flops to school.
 
Bruce

25 Jun 2012     



zailda
Brazil

Hi!

Can ´t = negative when must is used in the sense of obligation / prohibition.

You must do your homework on time. / You can ´t turn in your homework incomplete.

Mustn ´t = negative when must is used in the sense of probability.

Steve must be home now. / Steve mustn ´t be at his office; I heard he ´s sick in bed.

Have a nice day!

Zailda Coirano

25 Jun 2012     



noeneo
Indonesia

hi..
according to me can ´t is used to show an inability, e.g: ´i can ´t do this work �. while mustn ´t is used to show prohibition, e.g: you mustn ´t be late again!

11 Jul 2012