Apostrophes are used in two situations: to form possessive nouns and to form contractions. Possessive nouns show ownership. For example, look at this sentence: "My brother's favorite food is tacos." In this sentence, "brother's" is possessive; the brother owns (or has) the food. Contractions are single words that use an apostrophe to combine two words. "Can't," "I'll," and "she'd" are all contractions. Whether you need help with apostrophe worksheets or just want a refresher on the topic, read on to find out the rules for forming possessives and contractions.

Know Your Singular and Plural Nouns

The correct placement of the apostrophe is the key to forming possessive nouns. To do this, you need to know whether the owner is singular or plural. A singular noun refers to one person, place, or thing. For example, "Sheila," "Rhode Island," and "store" are all singular nouns. A plural nouns refers to more than one person, place, or thing. "Snails," "men," and "books" are some examples of plural nouns.

Form the Singular Possessive

If the noun is singular, add an apostrophe and an "s" to form the possessive. These additions always come at the end of the word. For example, if you want to talk about the desk that belongs to a teacher, you would write, "the teacher's desk." Or, if you are writing about apples that belong to a farmer, you would say, "the farmer's apples." Note that some names end with "s" but still refer to singular nouns, such as "Chris" or "James." The rule for singular nouns holds, regardless of how the name ends. So, "Jess's pencil" is the proper way to write about the pencil that belongs to Jess.

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Form the Plural Possessive

If the owner is plural, look at the last letter of the word. Does it end in "s"? If so, just add an apostrophe at the end. For example, to talk about a club that belongs to a bunch of boys, you would write, "boys' club." Similarly, "cities' economy" refers to the economy shared by one or more cities.

Add Apostrophes When Needed

If a plural noun does not end in an "s," add an apostrophe and an "s" to form the possessive. So, if you're writing a book for children to read, you're creating a "children's book." If in that book, a group of mice share some cheese, you would write, "mice's cheese." If the cheese used to belong to a girl named Jess, would it be "Jess's" or "Jess'" cheese? The answer is "Jess' cheese."

Forming Contractions With Apostrophes

Use an apostrophe to take the place of one or more missing letters in a contraction. For example, "can't" is a combination of the words "can" and "not." The apostrophe takes the place of the "n" and "o" in "not." Keeping this rule in mind can help you avoid misusing contractions. For example, when considering to use the contraction "we're" in a sentence, make sure that "we are" makes sense in its place. If not, you may mean "where" (in reference to place) or "wear" (as in wearing clothes).

Further Apostrophe Practice Tips

Now that you know about apostrophes, try not to overuse them. Often, writers mistakenly place apostrophes in words that are simply plural. When using an apostrophe with a noun, always ask yourself, "Does this person/place/thing own something?" If not, you do not need an apostrophe. At the same time, as you continue your apostrophe practice it is important to follow rules to make sure you are not misusing them: for example, never add an "s" followed by an apostrophe to form a possessive noun. To determine whether you've placed the apostrophe in the right place of a possessive noun, try this trick: Cover up the apostrophe and the following "s" (if there is one). The remaining word should be the owner. For example, read this sentence: "The girls' books are on the shelf." The placement of the apostrophe tells us that two or more girls have books on the shelf.

About the Author

Blake Flournoy is a writer, reporter, and researcher based out of Baltimore, MD. Working independently and alongside professors at Goucher College, they have produced and taught a number of educational programs and workshops for high school and college students in the Baltimore area, finding new ways to connect students to biology, psychology, and statistics. They have never seen Seinfeld and are deathly scared of wasps.