Måtte is an old form of the verb må, and it's not really used much except by like really old people. not even the verb itself, må, is used as much in swedish as it used to be. it's like the conditional form of the word or something, another form of that verb is Månne, but that's not used any more either.
fy is used more often, and is something you might say as an exclamation, for example:
fy vad äckligt det luktar! = it smells nasty!
it's often followed by the swear word fan, for example:
fyfan vad äckligt! = f*ck that's disgusting!
you can also use it when you tell someone what not to do, for example:
fy dig, så gör man inte! = shame on you, you don't do that! (mostly used when you talk to little children or dogs, it seems a bit patronizing)
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Måtte is an old form of the verb må, and it's not really used much except by like really old people. not even the verb itself, må, is used as much in swedish as it used to be. it's like the conditional form of the word or something, another form of that verb is Månne, but that's not used any more either.
fy is used more often, and is something you might say as an exclamation, for example:
fy vad äckligt det luktar! = it smells nasty!
it's often followed by the swear word fan, for example:
fyfan vad äckligt! = f*ck that's disgusting!
you can also use it when you tell someone what not to do, for example:
fy dig, så gör man inte! = shame on you, you don't do that! (mostly used when you talk to little children or dogs, it seems a bit patronizing)