Language & Words
Grammar & Punctuation Quiz
Affect vs effect, Oxford commas, and dangling modifiers — 50 grammar questions to humble you.
Affect vs effect, Oxford commas, and dangling modifiers — 50 grammar questions to humble you.
The Grammar & Punctuation Quiz is a free online quiz that tests your grammar knowledge with 50 questions about commonly confused words, punctuation rules, and English language myths. Studies suggest that grammatical errors in professional writing reduce trust by up to 40%.
Each round presents 10 randomized questions from a pool of 50, with four multiple-choice options and instant feedback after every answer. Your final score comes with a performance tier and shareable results.
You'll tackle commonly confused words like affect vs effect and fewer vs less, master punctuation marks from semicolons to em dashes, identify sentence errors like comma splices and dangling modifiers, and bust grammar myths about split infinitives and ending sentences with prepositions.
"Affect" is usually a verb meaning to influence ("The weather affects my mood"), while "effect" is usually a noun meaning a result ("The effect was immediate"). A helpful mnemonic: Affect is the Action (both start with A), Effect is the End result (both start with E).
The Oxford comma (the comma before "and" in a list) is optional in most style guides, but it can prevent ambiguity. In 2018, a missing Oxford comma cost a Maine dairy company $5 million in a lawsuit over overtime pay, proving that punctuation can have real-world consequences.
No. The "rule" against ending sentences with prepositions is a myth based on Latin grammar that was wrongly applied to English. Even Winston Churchill reportedly mocked it, and every major modern style guide considers it perfectly acceptable.
Last updated: March 2026