It's possessive. It's often followed by S's. And it's sometimes tricky when it comes to its usage. It's the apostrophe. Laura McClure gives a refresher on when to use apostrophes in writing. [3:14]

What is an apostrophe? Where are apostrophes found in writing? Use this website to learn more about these crazy little punctuation marks.

This entry explains and provides examples of when and how to use the apostrophe to show ownership and to form the plural of letters, numbers, and signs used as words. It also explains when not to use apostrophes such as with the pronoun...

This lesson has twenty items to test your understanding of apostrophes. Print the exercise and punctuate correctly. Answers are provided at the end of the exercise, along with an online handout on the rules for using apostrophes.

Discusses the two main functions of apostrophes: contractions and forming possessives.

A short guide on how to use apostrophes correctly.

This site gives a very clear explanation of a gerund and its noun qualities. This resource explains how to use the possessive case with a gerund. A quiz is provided to check understanding of this concept.

This module explains how to use apostrophes to form possessive nouns and pronouns, provides links to exercises for each new idea, and a link to a post lesson quiz.

This site offers exercises in the sometimes confusing use of plurals of possessives. In each space write "C" if correct, or "I" if incorrect. Then click on "Submit Application" for the answers.

This is a 10-question, self-grading exercise/quiz on the use of Apostrophes.

This is a 10-question, self-grading exercise/quiz on the use of Apostrophes.

This is a 10-question, self-grading exercise/quiz on the use of Apostrophes.

This is a 10-question, self-grading exercise/quiz on the use of Apostrophes.

This page focuses on the rules for the uses and misuses of the apostrophe including contractions and omissions, possessive nouns, possessive pronouns, how to write joint possession, plurals, apostrophes with surrounding punctuation, and...

In this slideshow tutorial, the punctuation topic of "the apostrophe" is reviewed. Each slide provides a different purpose for using an apostrophe.

Is it it's or its? Learn the basics about apostrophes here!

This Purdue Online Writing Lab article explains the three uses of the apostrophe.

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.

This lesson focuses on the rules for apostrophe use. It includes a list of rules and examples of apostrophe use and links to a website on apostrophe rules.

A good explanation of Plural Forms for the student. Site also offers a quiz at the end. L.11-12.2b Spelling

Learn proofreading techniques to use in checking for correct punctuation.

A brief description of the rules, usage, and examples of the "apostrophe" in English punctuation.

An interactive exercise where students practice apostrophe use with plural nouns, singular and plural possessives, possessive pronouns, and irregular plural nouns. In each of the six sentences, students choose the correct apostrophe...

This site contains practical and useful information about the following: commas, semicolons, colons, dashes, parentheses and brackets, ellipsis points, quotation marks, and apostrophes. CCSS.ELA-Literacy.CCRA.L.2