Comma Usage: Avoid Confusion in Clauses & Contrasting Sentence Parts

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: Sentence Fragments, Comma Splices and Run-on Sentences

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
Your next lesson will play in 10 seconds
  • 0:08 Avoid Confusion
  • 0:29 Use Commas to Separate…
  • 1:43 Use Commas to Separate…
  • 2:56 Use Commas to Separate…
  • 3:31 Use Commas to…
  • 4:41 Lesson Summary
Add to Add to Add to

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Login or Sign up

Create an account to start this course today
Try it free for 5 days!
Create An Account

Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Christopher Curley
Learn more about comma usage from the pros! There are just too many ways to use the comma (it's a basic punctuation mark, after all) to fit in one sentence. Watch here to learn about some of the more common traps students fall into when trying to put commas in the right place.

Avoid Confusion

Knowing where to put commas in a sentence can be tricky, especially because seemingly similar-looking sentences require different comma usages. Oftentimes, it helps to verbalize the sentence out loud if you're not sure where the commas are supposed to go, listening to where you would naturally pause. In some instances, however, even that won't work.

Use Commas to Separate Independent Clauses

Normally, when there are only two pieces of a sentence connected by a conjunction like 'and,' you wouldn't need a comma in between them - as in, 'I like swimming through fire and juggling bobcats.' However, any time you have two independent clauses in the same sentence - an independent clause being a clause with at least one subject and one verb that can stand on its own as a sentence - they need more than just a comma to separate them. Instead, they have to be separated by either a semicolon, a colon, or a comma accompanied by a coordinating conjunction - as in, 'I like swimming through fire, but I love juggling bobcats.'

If you wrote:

I like swimming through fire, I love juggling bobcats.

you would be committing a grammatical error called a comma splice. However, add any comma plus a coordinating conjunction - you can use the mnemonic FANBOYS (for, and, nor, but, or, yet, and so) to remember which conjunctions are considered coordinating conjunctions - and you're all set.

I ran to stop him, for he was letting the dragon level Tokyo.

Use Commas to Separate Non-Essential Elements

Sentences are made up of essential and non-essential clauses (another name for the main clause is the essential clause). When you've got a non-essential clause in a sentence, it needs to be offset with commas. Here's an example:

Jonathan, though he was destined to become King of the Spider-People, just wanted to be an accountant.

The middle part there, 'though he was destined to become King of the Spider-People,' can easily be pulled out of the sentence and the sentence will still make sense - that is, it would read, 'Jonathan just wanted to be an accountant.' Therefore that middle clause is non-essential, and it needs to have commas offsetting it on either side. A non-essential clause also can't stand on its own as a sentence, which is one way to help you decide whether it needs those commas or not.

You can also offset non-essential clauses with dashes, as in, 'Jonathan - though he was destined to become King of the Spider-People - just wanted to be an accountant.' It's the same rule, and it sounds pretty similar when I read it, except that the dashes pop the non-essential element out more for the reader and are therefore more appropriate when you want to highlight that a certain element or characteristic is particularly special.

Use Commas to Separate Contrasting Parts

You should also place a comma when two parts of the sentence contrast each other. This is a case where you don't need a conjunction or a semicolon to separate the clauses. For instance:

He was laughing at you, not with you.

The samurai was reserved, almost stoic.

Another special case like this is when you want to indicate a natural pause (this is the primary use of the comma and how it sounds in our speech, after all) - as in: 'You've been paying close attention to this lesson, haven't you?' You will need a comma when you ask a question at the end of a sentence in this manner.

Use Commas to Eliminate Confusion

We touched on this a little bit in the previous comma lesson when we talked about the Oxford comma - that's the one that appears last before the conjunction when you're writing a list of things - and the general rule is the same as the specific was in that case. If putting a comma in makes the sentence clearer, then put it in. If it doesn't, leave it out. Let's look at one key example and how commas affect it.

When prepping for space flight practice is essential.

To unlock this lesson you must be a Study.com Member.
Create your account

Register for a free trial

Are you a student or a teacher?
I am a teacher

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back

Earning College Credit

Did you know… We have over 95 college courses that prepare you to earn credit by exam that is accepted by over 2,000 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it free for 5 days!
Create An Account