I was studying the words 何十/何百/何千, and I often see the particles「も」and「の」after.

For example,




The「も」I think is used to emphasize that there's a large quantity, but what is the purpose of 「の」?

I also found some sentences with a similar pattern, but 「の」 is not used.



Why is that the case?


It is all about grammar and nothing else.

「(Number) + 」 functions adverbially to modify a verb.

「(Number) + + 」 functions adjectivally to modify a noun.

Let us look at your example sentences:


「何十冊もの」 modifies the noun 「本」.


「何千もの」 modifies the noun 「車」.


In this sentence, 「何十冊も」 modifies the verb phrase 「持っている」.

What would happen if you inserted a 「の」 following the 「も」, then?

In the new sentence:


「何十冊もの」 will simply modify the noun 「本」 instead. The meaning of the sentence will virtually stays the same. The new sentence will just have a different grammatical structure.

EDIT: I did not mention this, but this usage of 「も/もの」 always indicates that the speaker thinks the quantity in question is rather large as the questioner stated.

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