People Who Live in Glass Houses

glass-house-76934_1920Welcome back for the last of four sessions about the importance of commas in “Punctuation Saves Lives: Part 4”—this time we’re looking at using commas around extra information in a sentence. Here’s the conundrum I presented at the end of my last blog:

Which sentence is correct: the one without commas or the one with commas?

People who live in glass houses should get dressed in the basement.

People, who live in glass houses, should get dressed in the basement.

If you chose the first one, you’re right. If commas are placed around the information “who live in glass houses,” the sentence would be making a sweeping generality that seems ridiculous. The whole sense of the sentence changes based on whether it contains the commas. In our examples, if we include the commas, we’re saying that all people should get dressed in the basement, a statement that clearly doesn’t seem logical. That isn’t the same message that we get if we remove the commas. The information is essential to the meaning of the sentence because it limits or narrows the noun it’s talking about. Without the commas, the phrase “who live in glass houses” narrows the group of people who should get dressed in the basement: only those who live in glass houses.

When trying to determine if the information is extra or essential, it’s necessary to ask yourself, “Do I want to limit or narrow the person, place, or thing being described?” If you are, then DO NOT use commas. Commas in this setting indicate an extra or non-essential description.

Not every case of whether to use commas is as obvious as the previous one. Here’s a set of examples where the information may or may not need to be set off by commas, depending on what a writer is trying to communicate:

My brother who lives in California has never been to New York.

My brother, who lives in California, has never been to New York.

The first version communicates that the speaker/writer has more than one brother, and that a specific one (the one who lives in California) has never been to New York. The second version of the sentence implies that either the writer/speaker has only one brother, so there is no need to narrow the options or that the writer isn’t concerned about differentiating that brother from his or her other brothers. The information within the commas acts as extra material that doesn’t change the meaning of the sentence. The difference is subtle in this set of examples, and the reader wouldn’t be able to judge one version as being more correct than the other without knowing the writer’s intent. So even when the commas are neither obviously correct nor incorrect, there is a subtle shift in what’s being communicated.

The more often you know why you’re using a comma or any other punctuation mark, the more often you’re in control of your writing and your message. My hope is that you’ll be able to keep these reminders about comma usage in mind when you’re revising your own work, building your confidence as you continue to grow as a writer and communicator!


Hesitating in Front of the Door

Welcome back for the third installment of “Punctuation Saves Lives”! Last time, I introduced the use of a comma and a “FANBOY” between two complete sentences. This time, I’ll be discussing the use of a comma after an introductory phrase or dependent clause. Dependent clauses look very much like a complete sentence, but they have a signal word or words in front of them that change their function.

Example of a stand-alone complete sentence: The young man hesitated in front of the door.


Example of a dependent clause that cannot work as a complete sentence: Although the young man hesitated in front of the door, . . . .

In the second example, we’re left waiting for the rest of the sentence. The only difference is the “although” in front of the complete sentence. Suddenly, that sentence can no longer stand alone; it becomes a dependent clause. A dependent clause needs to be hooked up with a complete sentence to function properly. However, it doesn’t have to come at the front of a sentence—it can also be placed at the end of a sentence. When a dependent clause precedes a complete sentence, a comma is used to separate the two. Let me rearrange that sentence. A comma is used to separate the two clauses when a dependent clause precedes an independent clause. Did you catch what I did there? I used a dependent clause followed by a comma and a complete sentence. Then I started with the complete sentence and added the dependent clause at the end, without a comma separating them.

Let’s look at the two examples above about the young man at the door. When you read the first example (the stand-alone sentence) the pitch of your voice should go down. Dropping our pitch at the end of a sentence is one way we indicate to our listener that the sentence is finished. If you read the second example (the dependent clause) out loud, the pitch of your voice should stay even at the end of the clause. So, if you’re having problems identifying whether a clause is dependent or not, try reading it aloud and listen for the pitch of your voice at the end of the clause. If it stays even throughout, it’s probably a dependent clause and needs to be followed by a comma and a complete sentence. If your pitch goes down, it’s probably already a complete sentence and can stand alone.

An introductory phrase works the same way as an introductory dependent clause. They both precede the main part of the sentence, and they both enhance the meaning of the complete sentence that follows, so the introductory phrase should be followed by a comma before adding the rest of the sentence. The difference between the two is that an introductory phrase doesn’t have a subject and a verb that can be seen in a dependent clause.

Examples of introductory phrases:

Entering the turn lane, I waited for the light to turn green before I proceeded.

In the early morning, the dew sits lightly on the grass.

We’ve got just one more installment of “Punctuation Save Lives,” about using commas around extra/nonrestrictive material. Here are two sentences we’ll be discussing next time. Which of these sentences is correct?

People who live in glass houses should get dressed in the basement.


People, who live in glass houses, should get dressed in the basement.

Join me next time to find out if you chose the correct answer!