Even after years of learning it in school, grammar is just one of those things people still mess up.
It's hard. Words and phrases that sound fine in your head can suddenly look like gibberish when written down ... that is, if you've even realized you made a mistake in the first place.
It's easy for little grammar mistakes to slip by -- especially when you're self-editing. But how do you prevent grammatical errors if you're not even aware you're making them?
Why, by reading posts like this, of course. ;) So read through this post and see which common grammar mistakes resonate with you the most. Make a mental note to avoid that mistake in the future, or heck, just bookmark this blog post to remind yourself of them over and over (and over) again.
Eliminate grammatical errors from your writing by downloading our free writing style guide here.
25 Common Grammar Mistakes to Check For in Your Writing
1) They're vs. Their vs. There
One's a contraction for "they are" (they're), one refers to something owned by a group (their), and one refers to a place (there). You know the difference among the three -- just make sure you triple check that you're using the right ones in the right places at the right times. I find it's helpful to search through my posts (try control + F on PC or command + F on Mac) for those words and check that they're being used in the right context.
Correct Usage: They're going to love going there -- I heard their food is the best!
2) Your vs. You're
The difference between these two is owning something versus actually being something:
You made it around the track in under a minute -- you're fast!
How's your fast going? Are you hungry?
See the difference? "Your" is possessive and "you're" is a contraction of "you are." Again, if you're having trouble keeping them straight, try doing another grammar check before you hit publish.
3) Its vs. It's
This one tends to confuse even the best of writers. "Its" is possessive and "it's" is a contraction of "it is." Lots of people get tripped up because "it's" has an 's after it, which normally means something is possessive. But in this case, it's actually a contraction. Do a control + F to find this mistake in your writing. It's really hard to catch on your own, but it's a mistake everyone can make.
4) Incomplete Comparisons
This one drives me up a wall when I see it in the wild. Can you see what's wrong with this sentence?
Our car model is faster, better, stronger.
Faster, better, stronger ... than what? What are you comparing your car to? A horse? A competitor? An older model?
When you're asserting that something should be compared to something else, make sure you always clarify what that something else is ... otherwise it's impossible for your readers to discern what the comparison actually means.
5) Passive Voice
If you have a sentence with an object in it -- basically a noun that receives the action -- passive voice can happen to you. Passive happens when the object of a sentence is put in the beginning of a sentence instead of at the end. With passive voice, your writing comes across as sounding weak and unclear.
Hold up. Re-read that last paragraph I just wrote -- there's waaaaaay too much passive voice. See how it seems kind of jumbled and not quite punchy? Let's try that again.
Passive voice happens when you have an object (a noun that receives the action) as the subject of a sentence. Normally, the object of the sentence appears at the end, following a verb. Passive writing isn't as clear as active writing -- your readers will thank you for your attention to detail later.
Make sense? It's kind of a complicated thing to describe, but active voice makes your writing seem more alive and clear. Want to get into the nitty-gritty of avoiding passive voice? Check out this tip from Grammar Girl.
6) Dangling Modifiers
I love the name of this mistake -- it makes me think of a dramatic, life-or-death situation such as hanging precariously off a cliff. (Of course grammar mistakes are never that drastic, but it helps me remember to keep them out of my writing.)
This mistake happens when a descriptive phrase doesn't apply to the noun that immediately follows it. It's easier to see in an example taken from my colleague over on the HubSpot Sales Blog:
After declining for months, Jean tried a new tactic to increase ROI.
What exactly is declining for months? Jean? In reality, the sentence was trying to say that the ROI was declining -- not Jean. To fix this problem, try flipping around the sentence structure (though beware of passive voice).
Jean tried a new tactic to increase ROI after it had been declining for months.
Better, right?
7) Possessive Nouns
Most possessive nouns will have an apostrophe -- but where you put that apostrophe can be confusing. Here are a few general rules to follow:
If the noun is plural, add the apostrophe after the s. For example: the dogs' bones.
If the noun is singular and ends in s, you should also put the apostrophe after the s. For example: the dress' blue color.
On the other hand, if the noun is singular and doesn't end in an s, you'll add the apostrophe before the s. For example: the lizard's tail.
Simple, right? If you want a deeper dive into the rules of possessive nouns, check out this website.
8) Affect vs. Effect
This one is another one of my pet peeves. Most people confuse them when they're talking about something changing another thing.
When you're talking about the change itself -- the noun -- you'll use "effect."
That movie had a great effect on me.
When you're talking about the act of changing -- the verb -- you'll use "affect."
That movie affected me greatly.
9) Me vs. I
Most people understand the difference between the two of these ... until it comes time for them to use one in a sentence. They'll say something like:
When you get done with that lab report, can you send it to Bill and I?
But that's wrong.
Try taking Bill out of that sentence -- it sounds weird, right? You would never ask someone to send something to "I" when he or she is done. The reason it sounds weird is because "I" is the object of that sentence -- and "I" should not be used in objects. In that situation, you'd use "me."
When you get done with that lab report, can you send it to Bill and me?
Much better.
10) Do’s and Don’ts
I'm not talking about the do's and don'ts of grammar here -- I'm talking about the actual words: "do's" and "don'ts." They look weird, right? That's because of two things:
- There's an apostrophe in one to make it plural ... which typically isn't done, and
- The apostrophes aren't put in the same place in both words.
Unfortunately, it's AP Style ... so we just have to live with it. It's a hot angle for content formats, so I wouldn't shy away from using it. But when you're checking your writing for grammatical errors, just remember that the apostrophes should be in different places.
Note: There are different schools of thought about how to punctuate this one depending on what style guide/usage book you're using. The Chicago Manual of Style, for instance, recommends "dos" and "don'ts." The important thing is to be consistent and stick to one style guide, whether it's AP Style, Chicago, or your own house style guide.
11) i.e. vs. e.g.
Confession: I never remember this rule, so I have to Google it every single time I want to use it in my writing. I'm hoping that by writing about it here, the trend will stop.
Lots of people use the terms interchangeably when trying to elaborate on a point, but they really mean two different things: "i.e." roughly means "that is" or "in other words," while "e.g." means "example given" or "for example." The former is used to clarify something you've said, while the latter adds color to a story through an example.
12) Peek vs. peak vs. pique
This is another one I often see people mess up even if they know what they mean.
- Peek is taking a quick look at something -- like a sneak peek of a new film.
- Peak is a sharp point -- like the peak of a mountain.
- And pique means to provoke or instigate -- you know, like your interest.
If you're going to use one in your writing, stop and think for a second -- is that the right "peek" you should be using?
13) Who vs. That
This is a tricky one. These two words can be used when you're describing someone or something through a phrase like "Lindsay is a blogger who likes ice cream." When you're describing a person, be sure to use "who." When you're describing an object, use "that." For example, you should say "Her computer is the one that overheats all the time." It's pretty simple, but definitely something that gets overlooked frequently.
14) "Alot" vs. A lot vs. Allot
Hate to break it to all of you "alot" fans out there ... but "alot" is not a word. If you're trying to say that someone has a vast number of things, you'd say they have "a lot" of things. And if you're trying to say that you've set aside a certain amount of money to buy something, you'd say you "allotted" $20 to spend on gas.
If you're trying to remember to stay away from "alot," check out this awesome cartoon by Hyperbole and a Half featuring the alot. That face will haunt you for the rest of your content marketing days.
15) Into vs. In to
Let's clarify the "into" versus "in to" debate.
They're often confused, but "into" indicates movement (Lindsay walked into the office) while "in to" is used in lots of situations because the individual words "to" and "in" are frequently used in other parts of a sentence. For example, "to" is often used with infinitive verbs (e.g. "to drive"). Or "in" can be used as part of a verb (e.g. "call in to a meeting").
So if you're trying to decide which to use, first figure out if the words "in" or "to" actually modify other words in the sentence. If they don't, then ask yourself if it's indicating some sort of movement -- if it does, you're good to use "into."
16) Lose vs. Loose
When people mix up "lose" and "loose," it's usually just because they're spelled so similarly. They know their definitions are completely different.
"Lose" is a verb that means "to fail to keep or maintain; fail to win; cease to have," like losing your keys or losing a football match.
"Loose" is an adjective that means "not tight" or "not closely constrained," like loose clothing or a loose tooth.
A trick for remembering the difference is to think of the term "loosey-goosey" -- both words that make up that compound word are spelled with two o's.
17) Then vs. Than
What's wrong with this sentence?
My dinner was better then yours.
*Shudder.* In the sentence above, "then" should be "than." Why? Because "than" is a conjunction used mainly to make comparisons -- like saying one thing was better "than" another. "Then" is mainly an adverb used to situate actions in time: We made dinner, and "then" we ate it.
18) Use of Commas
There are entire courses on correct comma usage, but let's go over some of the more common comma use cases here ...
To separate elements in a series.
Each element in a series should be separated by a comma. For example: "I brought a jacket, a blanket, and an umbrella to the park." That last comma is optional. It's called an "Oxford comma," and whether you use it depends on your own internal style guide.
To separate independent clauses.
You can use commas to separate independent clauses that are joined by "and," "but," "for," "or," "nor," "so," or "yet." For example, this is correct: "My brother is very smart, and I've learned a lot from him."
An independent clause is a sentence that can stand on its own. Here's how to test it: Would the second part of the sentence (following one of those coordinating conjunctions) make a full sentence on its own? If so, add a comma. If it doesn't, leave it out.
To separate an introductory word or phrase.
At the beginning of a sentence, we often add an introductory word or phrase that requires a subsequent comma. For example, "In the beginning, I had no idea how to use a comma." Or, "However, after reading an awesome blog post, I understand the difference." Other common introductory words and phrases include "after," "although," "when," and "while."
To learn about more use cases for the comma, check out this blog post from Daily Writing Tips.
19) Assure vs. Insure vs. Ensure
All of these words have to do with "making an outcome sure," which is why they're so often mixed up. However, they aren't interchangeable.
- "To assure" means to promise or say with confidence. For example, "I assure you that he's good at his job."
- "To ensure" means to make certain. For example, "Ensure you're free when I visit next weekend."
- Finally, "to insure" means to protect against risk by regularly paying an insurance company. For example, "I insure my car because the law requires it."
20) Less vs. Fewer
You know the checkout aisle in the grocery store that says "10 Items or Less"? That's actually incorrect. It should be "10 Items or Fewer."
Why? Because "items" are quantifiable -- you can count out 10 items. Use "fewer" for things that are quantifiable, like "fewer M&Ms" or "fewer road trips." Use "less" for things that aren't quantifiable, like "less candy" and "less traveling."
21) Semicolons
Semicolons are used to connect two independent clauses that, though they could stand on their own, are closely related. For example, you could use a semicolon in the sentence: "Call me tomorrow; I'll have an answer for you by then."
Notice that each clause could be its own sentence -- but stylistically, it makes more sense for them to be joined. (If there's a coordinating conjunction between the two clauses -- like "and," "but", or "or" -- then use a comma instead.)
You can also use semicolons to separate items in a list when those items contain commas themselves.
22) Compliment vs. Complement
These two words are pronounced exactly the same, making them easy to mix up. But they're actually quite different.
If something "complements" something else, that means it completes it, enhances it, or makes it perfect. For example, a wine can complement a meal, and two colors can complement each other.
The word "compliment" though, refers to an expression of praise (as a noun), or to praise or express admiration for someone (as a verb). You can compliment your friend's new haircut, or pay someone a compliment on his or her haircut.
23) Farther vs. Further
People often use "farther" and "further" interchangeably to mean "at a greater distance."
However, in most countries, there are actually subtle differences in meaning between the two: "Farther" is used more to refer to physical distances, while "further" is used more to refer to figurative and nonphysical distances. So while Paris is "farther" away than Madrid, a marketing team falls "further" away from its leads goal. (Note: The word "further" is preferred for all senses of the word in the U.K., Australia, Canada, and elsewhere in the Commonwealth of Nations.)
The word "further" can also be used as an adjective or as an adverb to mean "additionally." For example, "I have no further questions."
24) En Dash vs. Em Dash
Both "–" and "—" are versions of the dash: "–" is the en dash, and "—" or "--" are both versions of the em dash. You can use either the en dash or the em dash to signify a break in a sentence or set off parenthetical statements.
The en dash can also be used to represent time spans or differentiation, such as, "That will take 5–10 minutes."
The em dash, on the other hand, can be used to set off quotation sources, such as, "'To be, or not to be, that is the question.' —Shakespeare."
25) Between vs. Among
Let's clear this one up: The word "between" is used to refer to two (or sometimes more) things that are clearly separated, and the word "among" is used to refer to things that aren't clearly separated because they're part of a group or mass of objects.
So you choose between a red shirt and a black shirt, but you choose among all your shirts. You walk between Centre Street and Broad Street, but you walk among your friends.
These are just a few grammar mistakes we've picked up. Which ones do you frequently catch?
Editor's Note: This post was originally published in November 2013 and has been updated for freshness, accuracy, and comprehensiveness.
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