Mga
Mga is the pluralizer word. It's written as "mga," but it's actually short for "manga." You place it in front of words you want to make plural.
"The dog." — "Ang ido."
"The dogs." — "Ang mga ido."
Flexibility
Hiligaynon is pretty relaxed with plurals. Sometimes native speakers will just drop the plural completely. In the sentence, "John ate apples," for example, you may or may not even hear the word "mga." However, if you really want to stress that John ate multiple apples, you would need to include "mga" in order to be specific.
Built-in Plural
Occasionally you'll run into words that have been conjugated to become plural. As an example, some words can be "aggrandized" with a "ka_" in front and "_an" at the end. For example, if you take the word "bata" (kid), you can pluralize it as "mga bata" (kids). However, in more formal speech or writing, you may see the word "kabataan," which means children. In that case, it's already plural and doesn't need "mga" in front of it. The word "tawo" (person) works similarly. "Mga tawo" would be "people," but in more formal speech you may hear the word "katawhan," also meaning "people." (The last part of "tawo" was dropped, which sometimes happens when words are conjugated.)
Approximate Numbers
Another interesting use of the word "mga" is to give an estimated number. For example, a number might be "about 20," "thirty-ish," or "fifty or so." In this case, you'd just put "mga" in front of the number.
"twenty minutes" — "bente ka minuto" (twenty = bente; minutes = minuto; ka is a number marker)
"about twenty minutes" — "mga bente ka minuto"