Khan Academy
Khan Academy: Introduction to the Possessive
Learn to use apostrophes to indicate possession, or ownership -- and when not to use them.
abcteach
Abcteach: Noun Skill Sheets
[Free Registration/Login Required] Teachers will find several worksheets for primary, elementary and middle school students identifying the role a noun or pronoun plays, collective nouns, diminutives, as well as definitions and...
Online Writing Lab at Purdue University
Purdue University Owl: Possessive Pronoun and Apostrophe
This Purdue Online Writing Lab article explains the three uses of the apostrophe.
Capital Community College Foundation
Guide to Grammar and Writing: Cases of Nouns and Pronouns
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.
BBC
Bbc: Skillswise: Plurals and Spelling Rules
The rules for spelling plural words and using them properly in English are made fun and easy with this BBC Skillswise worksheet for students.
Other
Sandhills Community College: The Apostrophe
A valuable resource for learning about the uses of the apostrophe in English punctuation, including apostrophes with possessive nouns as well as contractions. Provides examples.