My son was having trouble visualizing the forms of the words so I created pictures to guide him. Incredible what free clipart and endless hours will do! There are three activities in this one download. Hopefully this will give your kids a better understanding of singular, plural, singular possessive and plural possessive nouns. Please let me know how these activities worked/didn't work for you. God bless!
Activity 1: Sorting (10 -15min) formative
Activity 2: Sorting and Recording (20 -25 min) formative
Activity 3. Creating Sentences (20-25min)
(clipart is from mycutegraphics.com)