6 Common Types Of Punctuation Marks What happens when you mix up your punctuation? Well, there’s a million hilarious examples of grammatical mixups that point out the difference between—for example, Let’s eat Grandma vs. Let’s eat, Grandma. There’s even a grammar book named after the phrase eats shoots and leaves, which is what a panda does (as opposed to eats, shoots, and leaves). What a difference a comma can make! But what about the other punctuation marks? The major punctuation marks are the period, comma, exclamation point, question mark, semicolon, and colon. These marks organize sentences and give them structure. You’ve definitely seen them around, but do you know how they’re supposed to be used? The period A period (.) ends a declarative sentence. It appears immediately after the last letter of a sentence. Sounds simple enough, right? But there’s a great generational debate about whether one space or two is best after a period and before the first letter of the next sentence. Still, using a period to end a sentence makes it complete. Sandra walked to school this morning. You’ll also see periods used in abbreviations, such as when United States is shortened to U.S. and after a person’s initials (F.D.R.). The comma A comma (,) separates a series of independent sentences, nouns, adjectives, verbs, or phrases. That sentence you just read was a good example of commas separating nouns in a series. When a comma connects two independent sentences, you’ll usually see it with a conjunction (like and, but, or or). For example: He went to the movies, and his wife went to the mall. A comma can also be used to separate nonessential details in a sentence. For example: The boy, who has red hair, goes to my school. Who has red hair is information that doesn’t change the meaning of the sentence if it’s removed. Putting commas around an extra detail like this helps keep it from cluttering the sentence. Learn more about commas here. The exclamation point An exclamation point (!) ends a sentence emphatically. It replaces a period to express strong feelings, like excitement, anger, or surprise. Some sentences that tend to use exclamation points include: Help! Happy birthday! Get out! There’s a monster in the kitchen! An exclamation mark may replace a question mark when irony or an emphatic tone is meant: How could you! The question mark A question mark (?) is used at the end of a sentence that asks a direct question. For example: Where’s the library? This one is pretty straightforward. The semicolon A semicolon (;) separates sentences that are closely related but grammatically independent. For example: My brother isn’t feeling well; he’s been sick for a week. The two independent sentences could be separated by a period, but the semicolon works here since the two sentences are closely related. You can also use semicolons to separate a list of items that contain commas. For instance: I’ve been to Paris, France; London, England; Rome, Italy; and Madrid, Spain. Imagine how confusing reading that would be if there were commas where the semicolons are. The colon A colon (:) can introduce a list or a single item. For example: I need a bunch of supplies for school: pencils, glue, crayons, and scissors. Here’s an example of a colon introducing a single item: There’s one thing I want for my birthday: a car. (May we suggest a more realistic series separated with commas instead? The only things I want for my birthday are a car, some cash, and a waffle maker. See, what a difference a comma makes!) Write smarter with our thesaurus-powered Grammar Coach™! Get spelling help, synonyms suggestions, grammar check and more! Sign up now!