Free Common English Mistakes Quiz – Practice Correcting Errors
Read each sentence and choose the corrected version that avoids the common mistake. Get instant feedback on each choice. After answering all 5 questions correctly, detailed explanations will appear below each question to help you understand why that mistake is so common. Test and learn in a simple and fun way.
The Mistakes Almost Every Learner Makes at Least Once
Some English mistakes are so common they've become almost predictable — "less" instead of "fewer" with countable nouns, "could of" instead of "could have," or mixing up "affect" and "effect." These errors slip in not because learners don't know grammar, but because the correct and incorrect forms often sound identical when spoken.
This quiz is built entirely around these repeat offenders — the specific mistakes that show up again and again in essays, emails, and everyday conversation, even among learners who are otherwise quite advanced. Fixing them tends to have an outsized effect on how polished your English sounds, because they're so noticeable to native speakers and examiners alike.
Instead of long grammar explanations, each question here targets one common mix-up directly, so you can quickly identify your personal weak spots. Many learners find they consistently get the same one or two types wrong — once you notice the pattern, it becomes far easier to correct permanently.
Keep a small note of any mistake you get wrong here and re-read it a day later — spaced repetition is what finally makes these corrections stick. Our Confusing Words Quiz tackles a closely related set of everyday mix-ups.