Here's another post devoted to pronunciation. Pronunciation in English because there aren't many fixed rules for it. But the few there are must be known. One is the pronunciation of final regular verb "-ED" ending. And in this post you can see the rule to pronounce plural noun endings, 34d person singular "-(E)S" endings and "'S" possessive endings. At the same time you can check on plural spellings, too.
Video "-(E)S" ending pronunciation: