From Proto-Italic *is, from Proto-Indo-European *ís. Cognate with Oscan 𐌝𐌔𐌝𐌊 (ísík), Umbrian 𐌄𐌓𐌄 (ere), and further with Lithuanian jis, Proto-Slavic *jь.
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Practica parlar i memoritzar " is " i moltes altres paraules i frases a llatí .