I am teaching myself Latin. Right now I study how to make plural of nouns. I have found some rules online, depending on the ending of a noun in a nominative singular form. The website says that most times there are two versions of the plural. Is it like that? For example, an apple "malum", can I use both "mala" and "malums"?
(I have found only "mala" in a dictionary for apples in Latin.)
Thank you.
EDIT: Here is an illustration of the two options of a plural form rule:
@-a, plural -s or -ae
formula, formulas or formulae
@-ex, plural -exes or -ices
index, indexes or indices
@-eau, plural -eaus or -eaux
bureau, bureaus or bureaux
BUT:
@-us, plural -uses or -i
focus, foci or focuses
locus, loci [no: locuses]