Free punctuation quiz online: 10 real-world sentences, one error each. Spot apostrophe mistakes, Oxford comma omissions, spacing errors, and more. How well do you know your punctuation?
Find the error
I would of gone to the party if I had known about it.
This free punctuation quiz online presents 10 real-world sentences: the kind of errors that appear in emails, essays, and published content every day. Each question has one deliberate punctuation error drawn from the most common mistakes in written English: apostrophe confusion, Oxford comma omissions, spacing errors introduced by fast typing or copy-pasting, and style issues like em dash usage. After each answer, an explanation covers the underlying rule so you understand why it is wrong, not just that it is wrong.
Use this grammar quiz online to benchmark your punctuation knowledge, identify which rules you have not fully internalized, and review the explanations. After the quiz, run your own writing through the Punctuation Checker to scan for the same 11 error types automatically. For grammar beyond punctuation, use the Grammar Checker and the Clarity Checker.
Should be "would have": a contraction misheard as "would of"
"Their" = belonging to them. "There" = existence or location
Serial comma before "and/or" in a list removes ambiguity
Punctuation follows directly after the word: no leading space
Every new sentence needs a space after the preceding period
!! or ???: single marks are standard in formal writing
Typewriter habit: modern typography uses one space between words
Every opening " needs a closing " pair
Comma must be followed by a space before the next word
Space-hyphen-space ( - ) → use an em dash (—) for sentence breaks
A punctuation quiz presents sentences with deliberate errors and asks you to identify the mistake. This free punctuation quiz tests 10 real-world error types: apostrophe mistakes, Oxford comma omissions, spacing errors, and more: across 10 sentences. Each answer includes an explanation of the rule.
Each question shows a sentence with one punctuation error. Choose the error type from 5 options. Get instant feedback: correct answers turn green, wrong answers show the correct choice. After 10 questions, see your score and a full review of every answer.
Completely free with no signup, no usage limits, and no data sent to a server. The punctuation quiz runs entirely in your browser.
The quiz tests 10 error types: "would of/could of" contraction errors, "their/there" apostrophe confusion, missing Oxford comma, space before punctuation, missing space after period, repeated punctuation marks, double spaces, unclosed quotation marks, missing space after comma, and em dash usage.
After the quiz, each question shows the correct answer and an explanation of the rule. Use the free Punctuation Checker to scan your own writing for the same errors. The Grammar Checker catches tense and agreement errors the quiz does not cover.