This:

If you recognize the grammar error in this sign, good for you! The grammar police won’t be handing you a citation this time.

If you don’t recognize the error, the grammar police have officially given you a warning citation. Don’t worry—you can avoid paying any fines by reading this post and learning to recognize this and nine other common grammar mistakes.

Avoid These 10 Common Grammar Mistakes in Your Paper

I’m sure there are about a bajillion grammar errors you might make in any given paper, but I can’t cover them all in this post. Instead, let’s focus on 10 common grammar mistakes that will help keep the grammar police at bay.

Easily confused words

Some words sound almost the same and are spelled similarly, so it can be easy to get them mixed up. Here are five sets of words that are easily confused.

1. Then/Than

• Then generally refers to actions in time.

Example #1: If you don’t finish your paper, then you might fail the course.

Example #2: Emily went to the food court, then headed to the movies.

• Than is a comparison.

Example #1: John’s car is better than Carl’s.

Example #2: I’d rather enroll in calculus than physics.

2. Effect/Affect

• Effect means a result.

Example #1: Sunshine can have a great effect on people’s moods.

Example #2: Did the experiment demonstrate an effect on climate change?

• Affect means to influence.

Example #1: The speakers remarks didn’t affect her opinion.

Example #2: Eating dessert first never affects my appetite.

3. They’re/Their

• They’re is a contraction for “they are.”

Example #1: They’re going to the concert on Saturday.

Example #2: I hope they’re learning how to avoid grammar mistakes.

• Their shows possession or ownership.

Example #1: The children wanted their books stacked in the corner.

Example #2: The students hoped their tests would be graded on a curve.

4. Your/You’re

• Your shows possession or ownership.

Example #1: Where are your car keys?

Example #2: Lara left her books in your room.

• You’re is a contraction for “you are.”

Example #1: I heard that you’re going on vacation in July.

Example #2: Are you sure you’re driving in the right direction?

5. Its/It’s

• Its shows possession or ownership.

Example #1: The dog chased its tail.

Example #2: The leopard changed its spots.

• It’s is a contraction for “it is.”

Example #1: It’s time to board the plane.

Example #2: Lauren said it’s vital to keep the dog away from the crazy cat.

We all know the English language has a seemingly infinite number of confusing words, so if there are a few words that still confuse you, check out this list of easily confused words.

Feel like you’ve mastered all those confusing words but feel the grammar police are ready to fine you heavily for making unnecessary sentence errors? Fear no more. Here are a few tips to help with common grammar errors related to sentence structure.

Sentence errors

6. Comma splice

A comma splice incorrectly separates two or more complete sentences with a comma.

Example: I watched movies all night, I was tired the next morning.

This sentence is a comma splice because “I watched movies all night” and “I was tired the next morning” are both complete sentences and are joined incorrectly by a comma.

7. Run-on sentence

A run-on sentence incorrectly joins two or more complete sentences without any form of punctuation.

Example: The line at the concession was long so we decided not to wait.

This sentence is a run-on sentence because “The line at the concession was long” and “we didn’t want to wait” are both complete sentences but are not joined by proper punctuation. (They are instead joined incorrectly by the conjunction “so.”)

8. Sentence fragment

A sentence fragment is an incomplete sentence that’s missing a subject, a verb, or a complete thought.

Example: Stayed at the hotel.

This sentence is missing a subject, which makes it a sentence fragment.

Correcting sentence errors

Correct sentence fragments by making sure that all sentences have a subject, a verb, and a complete thought.

Correct comma splices and run-on sentences by using the following strategies.

Create two complete sentences by adding a period:

The car wouldn’t start, the battery was dead. (comma splice)

The car wouldn’t start. The battery was dead.

Correctly join the two sentences by adding a semi-colon:

Jayden and Gabriella got married Saturday it was a beautiful ceremony. (run-on sentence)

Jayden and Gabriella got married Saturday; it was a beautiful ceremony.

Make one of the sentences a dependent clause:

We went outside, we realized it was raining. (comma splice)

When we went outside, we realized it was raining.

Connect two complete sentences by adding a comma and a coordinating conjunction (also known as FANBOYS–for, an, nor, but, or, yet, so):

Sophia called me but I didn’t feel like answering her call. (run-on sentence)

Sophia called me, but I didn’t feel like answering her call.

Still feeling a little nervous? Worried that a member of the grammar police will catch you off guard and find out you’re still confused about apostrophes? Check out these tips on common grammar mistakes with apostrophes.

Apostrophe errors

Apostrophes are most often used in two instances:

• To form contractions
• To show possession

NEVER use an apostrophe to make words plural.
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Apostrophe tip: NEVER use an apostrophe to make words plural (that includes when using acronyms!).

Ari ordered five pizza’s for the party.

Ari ordered five pizzas for the party.

9. Contractions

An apostrophe can be used to indicate that letters have been omitted in a contraction. The apostrophe takes the place of the omitted letters.

Examples:

• Don’t (Do not)
• Can’t (Cannot or can not, depending on your intended meaning)
• Won’t (Will not)
• I’m (I am)
• Should’ve (Should have)

NOTE: Should’ve, could’ve, and would’ve are grammatically correct. “Could of,” “would of,” and “should of” are not grammatically correct and should never be used.

10. Possession

An apostrophe can be used to show possession or ownership.

Example #1: the woman’s scarf (the scarf belongs to the woman)

Example #2: the boy’s action figures (the action figures belong to the boy)

Leave the Grammar Police in the Rear-view Mirror

Now that you know how to avoid 10 common grammar mistakes, you can leave the grammar police in the dust…but only if you can recognize the error that I included at the beginning of the post.

Did you recognize the apostrophe error? Did you notice that the apostrophe is used incorrectly because it makes “Mom’s” and “Dad’s” possessive? In this case, both “Moms” and “Dads” should be plural. (No apostrophe is needed.)

Looking for a few more grammar and writing style tips? Read these articles:

• Dangling Modifier: Don’t Make This Funny Grammar Mistake
• 7 Grammar Rules That Everyone Should Learn
• 3 Ways to Focus on Concrete Language in Your Next Essay
• Why Eliminating Wordiness is So Important for Your Essay

Want to test your grammar skills on a few sample papers? See if you can spot any errors in our sample essays.

Still not sure if your paper is grammatically correct? Let the grammar police at Kibin make sure your paper is free of any grammar offenses. (Don’t forget: We can help with more than just grammar, so let us provide help with content and style too!)

Contractions represent a more efficient way to write and to speak. They allow us to convey our thoughts in fewer words. This is helpful considering we live in an era of text messages and 140-character Twitter updates. And, in days long past, before printing presses, English contractions saved writers the pain of writing out every single letter of every single word (Those quill pens must have been a real pain in the hand!).

While editing ESL papers at Kibin, I have found that many ESL writers are uncomfortable with the concept of English contractions. These writers misuse them, use them too liberally, or avoid them altogether.

In this post, I want to focus on the misuse of contractions. I’m going to teach you the fundamentals of English contractions, discuss which English contractions you should never use and why, and give you a heads-up on some of the more common informal contractions (But, don’t use them in your next English assignment…or else!).

The Important Apostrophe

First, let’s talk about how exactly you can create a single word out of two words. It involves using an apostrophe. An apostrophe is the punctuation mark found at the top of a letter. I’ve circled the apostrophe in red in the word “it’s” below:

This little punctuation mark has a big job to do when it comes to English contractions. It stands in for the letter or letters you omit.

For example, the contracted form of “do not” becomes “don’t.” As you can see, the apostrophe stands in for the “o” in “not.”

Similarly, the contracted form of “he will” becomes “he’ll.” In this contraction, the apostrophe stands in for the “wi” in “will.”

And “they would” becomes “they’d.” The apostrophe does the big job of standing in for “woul” in this contraction.

Warning! You Can’t Contract Just Any Word

Now that you know how to use the apostrophe to create English contractions, don’t get too carried away. You can’t just go in and contract any two words in the English language. The words you can contract are pretty much set in stone (and I’ll be going deeper into that in a future post).

Wouldn’t it be fun if you could, though? I might write something like, “Y’can’t just go’n an’contract jus’any’f t’words i’the Eng’language.” But, I won’t, because then I would sound drunk, which I’m not.

While most writers don’t try to contract every single word in the English language, I often see some commonly misused English contractions. With that in mind, here are three English contractions that you should never use:

 Amn’t

A lot of ESL writers make the mistake of thinking that since you can contract “is not” and “are not” into “isn’t” and “aren’t,” you should similarly be able to contract “am not” into “amn’t.”

The truth is, there is no contraction for “am not,” and “amn’t” is not a recognized word…anymore.

Yes, I said “anymore” because apparently “amn’t” and its cousin “an’t” were commonly used in the English language sometime in the 1600s.  And, surprisingly, “amn’t” is still used in Ireland and Scotland (no wonder those dialects are so difficult to understand for those accustomed to U.S. English).

Today, in U.S. English, you can still find some communities that use a distant cousin of “am’t.” That word is “ain’t.”

And, even though Christina Aguilera uses “ain’t” (incorrectly, I might add) in her lyrics, “ain’t” is considered highly informal and should not be used in most writing. Check out this great article for more information on “amn’t,” “an’t,” and “ain’t.”

Willn’t or Win’t

As tempting as it may be to use the apostrophe rule to contract “will not” into “willn’t” or even “win’t,” you shouldn’t.

The contraction of “will not” is a weird exception to the apostrophe rule, as it becomes “won’t.”

So, why is it an exception to the rule? The answer to this riddle comes from Old English habits. The word “will” has gone through quite the language evolution, including many spelling changes, one of which was “woll.” A sensible contraction of “woll” could indeed be “won’t.”

In addition, “willn’t” was an accepted form of this contraction for some time—even into the late 1800s. But, because the point of contractions is brevity, the ultimate favorite, which is still commonly used today, became “won’t.”

Read this post for more information about why “will not” is contracted as “won’t.”

I’s

You can contract “she has” and “she is” to make “she’s,” and you can contract “he has” and “he is” to make “he’s,” as well as “I am” to make “I’m,” and “I have” to make “I’ve.”

But, “I’s” is not a word.

I’m not sure why people use “I’s,” but I suspect it has something to do with misinterpreting the following two rules.

First of all, you can’t contract “I is” because “I is” has improper subject-verb agreement. “I” does not go with “is.” It’s just not right. The correct agreement is “I am,” so the correct contraction is “I’m.”

Second, and I think this is the more common problem, “I was” cannot be contracted into “I’s.” In English, you can’t contract verbs in simple past tense.

That being said, there are certain U.S. dialects where speakers use it as an informal contraction.  “I’s gonna do it!” is an informal English contraction of the phrase “I was going to do it.”

Aside from these three contraction no-nos, there are some that are technically legal, but that you shouldn’t use anyway.

Watch Out for Contractions that Native English Speakers Don’t Commonly Use!

These six contractions are grammatically legal, but they are not commonly used in either speaking or writing.

• Where’d (where had)
• Why’d (why had)
• When’d (when had)
• Why’d (why would)
• What’d (what would)
• When’d (when would)

These six contractions are uncommon for a simple reason. U.S. English speakers prefer using them to express questions with the past tense form of “did,” like this:

• Where’d (where did)
• Why’d (why did)
• When’d (when did)
• Why’d (why did)
• What’d (what did)
• When’d (when did)

So, when you ask, “Where’d you go?” native English speakers will think you are asking, “Where did you go?” and not “Where would you go?” The answer to these two questions would be very, very different (“I went to school in Missouri, but I would prefer to go to Hawaii”).

By playing favorites, English speakers avoid a lot of confusion in communication. However, please note that these contractions with “did” are highly informal and should only be used in speaking and informal writing.

You may have noticed that native English speakers like to mush a lot of their words together in informal speaking and writing. Let’s review a few of these informal contractions now.

Informal English Contractions (or Words that English Likes to Throw at You to Keep You on Your Toes)

This list includes a selection of common informal contractions in the English language.  These words aren’t even in the dictionary, and you’ll notice they don’t follow the rule of the apostrophe.

These informal words should never be used in academic or formal writing. The only time you might write them would be in a text or email message to a friend or in a fiction piece when you are trying to convey informality in your character’s dialogue.

Whatever you do, don’t use words like “lemme,” “gimme,” and “wanna” in your school writing or in a cover letter! They will get you nowhere fast.

Imagine writing a personal statement that said,  “Please lemme into your school. I wanna attend. Also, please gimme a scholarship, so I can afford it.”

Hopefully, reading this sentence gives you an understanding of why using informal contractions can be a problem.

That said, because these informal contractions are so common in everyday speech, I felt you might benefit from getting acquainted with them. Check out this site for even more examples of informal contractions.

So, there you have it, English contractions to never use. Let me know if you have any comments or questions by leaving me a message in the comments section below.

If you enjoyed this lesson, you might also enjoy reading Definite and Indefinite Articles for ESL Writers.

As with all things you learn, the more you practice, the better you will become. If you need more help with contractions, I suggest trying this English contractions test. And, of course, if you need to be sure that you are using all the right contractions in your next writing project, our ESL editors are here to help!