El plural S, ES
One flower
Six flowers
A friend
Two friends
Cuando la palabra termina en sh, ch, ss, o x, le agregamos es al final:
A dish · Five dishes
A match · Three matches
A class · Two classes

Para formar el plural de algunas palabras, agregamos la letra s al final:
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You can see how this popup was set up in our step-by-step guide: https://wppopupmaker.com/guides/auto-opening-announcement-popups/