To practice:
List several nouns and have your child say whether they’re common or proper nouns. For example, you might name dog (common), hat (common), Mississippi (proper), plant (common) and Roald Dahl (proper).
Look at a magazine with your child. Challenge her to find several examples of common nouns and proper nouns.
Read a story aloud and have your child listen for nouns. She can raise her hand when she hears a common noun, and stand when she hears a proper noun.