Put these nouns under the right category : countable or uncountable . write the countables nouns in the plural . mystery , knock , bread , hoof , murmur , information , mosquito , wether , carrot , candle , milk , toast, housework , mother tongue , practice , idiom , tomato , vocabulary , play , advice , money , butter , coin , hair , paper , potato countables : uncountables : !

Countable nouns:  mystery - mysteries,  knock - knocks, hoof - hooves,
mosquito - mosquitoes, carrot - carrots, candle- candles,  idiom - idioms, tomato - tomatoes, vocabulary - vocabularies, play - plays, coin - coins,  potato - potatoes, mother tongues. 
Uncountables:  bread,  murmur,  information,  weather,  toast,  housework ,  practice,  advice,  money,  butter,  hair,  paper. 

Countable nouns:  
mystery - mysteries  
knock - knocks
hoof - hooves
murmur-murmurs - в значении "шумы", например, Murmurs of the Earth - звуки Земли
mosquito - mosquitoes
carrot - carrots 
candle- candles 
mother tongues
idiom - idioms 
tomato - tomatoes
vocabulary - vocabularies
play - plays (в значении "пьесы")
coin - coins
hair-hairs - в значении "волоски" (два волоска)
paper-papers - в значении "документы"
potato - potatoes

Uncountables: 
bread 
murmur
milk
information  
weather
toast 
housework   
practice  
advice  
money 
butter 
hair  
paper