I'm having a difficult time understanding the use of の-Adj in the JLPT N5
grammar examples and practice I've been studying and haven't found a good
resource for finding the answer. The sentence is fairly simple but I can't
tell what the purpose of the の at the end of the Adj is in it. It goes:

> 大きいのは いくらですか。 Ookii-no wa ikura desuka?

Does anybody have any clue? Thank you!
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2018-09-23T21:14:39.777
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2018-10-02T00:59:34.857
2018-09-24T01:41:46.130
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question
particle-の questions i-adjectives sentence
Adjective-No in a Question format?
の in this case is a pronoun that can be translated to English as "one".

(More precisely, it's a "dependent indefinite pronoun")

Therefore:

> 大きい = "big" (adjective)
>
> 大きいの = "big one" (noun equivalent)

By applying this translation, we can see the problem that happens if we don't
use の:

> *大きいはいくらですか = "how much is the big" (wrong)
>
> 大きいのはいくらですか = "how much is the big one" (correct)

For more research on uses of の, I recommend reading the relevant chapters of
the book "A Dictionary of Basic Japanese Grammar".
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2018-09-23T22:04:48.663
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2018-09-23T23:03:53.240
2020-06-17T08:18:27.500
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answer
According to "A Dictionary of Basic Japanese Grammar", page 318:

> の: a nominalizer which is used when the nominalized sentence expresses a
> directly perceptible event. (...)
>
> Example sentence(s):  
>  日本へ行くのは簡単です。  
>  Going to Japan is easy.
>
> ...
>
> Formation:  
>  話すのは  
>  The act of talking
>
> 高いのは  
>  The expensive one
>
> 静かだったのは  
>  The one that was quiet
>
> ...
>
> の makes a noun equivalent from a sentence.
>
> ...
>
> There is another nominalizer こと. の and こと are sometimes mutually
> interchangeable. For example, [日本へ行くのは簡単です。] can be restated as:
>
> 日本へ行くことは簡単です。  
>  Going to Japan is easy.
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2018-09-24T01:26:07.047
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answer