You can make a "regular" noun plural by adding "s" to the end of it (dog/dogs, cat/cats, etc.). Many nouns, however, are "irregular" in their plural form: words like "half/halves," "lady/ladies," "child/children", "foot/feet" etc. Photo Irregular Plurals Fun Deck has 60 pairs (120 total cards) of photo cards to help students practice these difficult forms. Seven different rule cards with examples are included to help teach students rules for forming irregular plurals. Cards measure 3" x 4" and come in a sturdy storage box.