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Italian word questo comes from Proto-Indo-European *-h₂, Proto-Indo-European *yo-, and later Proto-Indo-European *só (That. This.)
*-h₂ (Proto-Indo-European)
Creates collective nouns, which refer to groups or sets of things.
*yo- (Proto-Indo-European)
*só (Proto-Indo-European)
That. This.
eccum isti (Latin)
questo (Italian)
This, that. This, this one, these This, these.