Of course, we don't just talk about one book , or a book . Sometimes we have to talk about book s , or two books , or many books .
Book becomes books , fox becomes foxes , etc.
So, please don't complain about the rules for forming plurals in Greek. Making a noun plural in Greek requires knowing both its gender and the letters with which it ends. Take a deep breath, because here we go. These tables, which are by no means complete, have been condensed from the excellent book, Teach Yourself Greek , by Aristarhos Matsukas.