Gerardd88 said that many languages still use the old latin and greek plural forms of words such a museum -> pl. musea. But, as far as I know, most languages use their own way of making plurals. Only English (afaik), uses the original plural form of some latin words (like abaci, algae, octopodes instead of the more English-like forms abacuses, algas, octopuses) so I'm surprised by him claiming that that's a common feature of many languages and I asked him to give an example of a language that does it besides English. I hope this makes my question clearer.