cuántos o cuánto
¿Por qué es "cuántos años" pero "cuánto cuestan"? Los todos son plurales, ¿verdad?
3 Answers
My friend ,, the answer to your question is very simple ... in the first sentence cuánto acts as an adjective because it is associated with the noun Año... and as per the spanish grammar rules tye adjectives (when used with countable nouns) have to agree in gender and number in concurrence with the noun they modify or describe ....
However in the second sentence ,, the same word "cuánto " is playing the role of an adverbio (an adverb) ... as it is modifying the verb costar .... say ,, for example we say .. cuánto cuestan las fresas .....in this sentence .. we have a verb costar (to cost) and we have a noun (fresas ) and we have the word cuánto (our magic word) .. but if u analyze the mechanism or the dynamics of this sentence ,, u would very well notice that the magic word cuánto here is married to the verb (and not the noun) ... (how much does it cost .....to buy the strawberries) ..so that is why it is playing the role of an adverb and the adverbs don't change form (singular, plural and gender) .... if in the same sentence ,, our magic word cuánto divorces the verb costar and now marries the noun " fresas" .. then it will need to agree with the noun .. for example .. cuántas fresas cuestan dos euros (how many strawberries will cost 2 euros) ..
Hope u understand the logic now .. hehe
It is the same as in:
How many
How much
Note that the noun año is in plural, whereas when you use costar you are questioning about the monetary value (valor en dinero) of something.
¿Cuánto+costar/valer? is a set phrase meant for asking for the money price of something, but then you have:
La independencia de la colonia nos costó muchas vidas, ¿cuántas costará la secesión?.
See how grammar is always consistent with itself?