10 Common Grammar Mistakes & How to Avoid Them

Published on August 20, 2025 by Nicole Routh, M.Ed. Revised on November 3, 2025

Learning about the most common grammar mistakes is one of the best ways to avoid errors. The 10 most common grammar mistakes include soundalike errors with words like “its” and “it’s,” unnecessary commas, subject-verb agreement errors, and comma splices.

The tips and examples below will help you spot common grammar mistakes in your writing or avoid them altogether. QuillBot’s Grammar Checker is also an invaluable resource for avoiding errors, and it’s completely free to use. 

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*Noone or No One | Correct Spelling & Examples

Published on June 25, 2025 by Kate Santoro, BS. Revised on November 4, 2025

No one is the correct spelling for the word that means “nobody.” Noone is a misspelling and is always incorrect.

Noone or no one examples
  • No one on the council voted against the proposal.
  • Noone on the council voted against the proposal.
  • I heard that no one did the assignment.
  • I heard that noone did the assignment.
  • Apart from Steve, no one likes tomatoes.
  • Apart from Steve, noone likes tomatoes.

Use QuillBot’s free Grammar Checker to make sure you always use no one and never noone.

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Yours or *Your’s | Correct Spelling, Use & Examples

Published on June 13, 2025 by Kate Santoro, BS. Revised on November 3, 2025

Yours is the correct spelling for the second-person possessive pronoun. Your’s—with an apostrophe—is a misspelling of yours and is always incorrect.

Possession is usually indicated by adding ‘s to a word, but possessive pronouns are the exception to this rule. This is why some people get confused when choosing your’s or yours.

Yours or your’s examples
  • I have my ticket, but I don’t have yours.
  • I have my ticket, but I don’t have your’s.
  • Are these pajamas yours?
  • Are these pajamas your’s?

QuillBot’s free Grammar Checker will make sure you always use yours and never your’s.

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*Ninty or Ninety | How Do You Spell 90?

Published on April 28, 2025 by Kate Santoro, BS. Revised on March 24, 2026

Ninety (with an “e”) is the correct spelling for the number that equals ten times nine (“90”). Ninty is a misspelling and is always incorrect.

Ninty or ninety example
  • My grandmother just turned ninety.
  • My grandmother just turned ninty.

Small mistakes like this can make your writing feel less polished. QuillBot’s Humanize AI tool can help refine your text so it reads smoothly, naturally, and without distracting errors.

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*Finaly or Finally | How Do You Spell Finally?

Published on April 23, 2025 by Kate Santoro, BS. Revised on November 3, 2025

Finally is the correct spelling for the adverb that means “after a long time” or “in the end.” Finaly is a misspelling and is always incorrect.

Finaly or finally example
  • After days of walking, we finally arrived at the town.
  • After days of walking, we finaly arrived at the town.

To avoid this mistake and others like it, use QuillBot’s free Grammar Checker.

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Due To or *Do To | Correct Spelling & Examples

Published on April 23, 2025 by Kate Santoro, BS. Revised on November 3, 2025

Due to is the correct spelling of the phrase that means “because of” or “owing to.” Do to is a misspelling of this phrase and is always incorrect.

Due to or do to example
  • Due to the storm, the airplane cannot take off.
  • Do to the storm, the airplane cannot take off.

QuillBot’s free Grammar Checker can make sure you avoid this common mistake in your writing.

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Onto or On To | Correct Spelling & Examples

Published on April 15, 2025 by Kate Santoro, BS. Revised on November 3, 2025

Onto is a preposition that expresses movement. On to are words that can appear next to each other but which don’t work together as a single unit.

As a general rule, use onto—and not on to—when you mean “on top of” or “upon.”

Onto or on to example
  • The cat jumped onto the roof.
  • The cat jumped on to the roof.

Use QuillBot’s Grammar Checker to quickly and easily find any mistakes with onto and on to.

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*Piece of Mind or Peace of Mind | Spelling & Examples

Published on April 2, 2025 by Kate Santoro, BS. Revised on November 3, 2025

Peace of mind is the correct spelling for the noun phrase that means “a feeling of being safe or content.” Piece of mind is a misspelling of this phrase and is incorrect in this context.

Piece of mind or peace of mind example
  • My home security system has given me a greater peace of mind.
  • My home security system has given me a greater piece of mind.

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