This instructional activity focuses on recognizing and demonstrating the standard use of apostrophes when using both singular and plural. It also provides a practice exercise.

In this writing and grammar tutorial, learn how to distinguish and use nouns and pronouns in English and whether they are subjective, nominative, possessive, or objective.

This site focuses on the three uses for apostrophes: forming possessives of nouns, forming plurals of lowercase letters, and showing omission of letters and provides examples of each.