Find and fix the grammar mistakes you keep making
Explore 3,800+ questions across 310+ grammar challenges, from A1/A2 to C1/C2.
- Take the level test (10 minutes)
- See how well you know each topic
- Practice your weak topics
- Take the test again and see your progress
Start with the free CEFR level test to find your estimated English level and the topics to fix first.
Or practice by topic: each of our challenges trains one grammar topic, and every question explains why the answer is right. Each result opens with a "Needs work" list that links straight to more practice. To find the topics you need, filter the challenges list by level or tag, or browse the category tag tree below.
Log in or create an account to keep your results. Your profile then shows a Progress map that rates every grammar area Weak, Fair, or Strong. Practice the weak topics and watch the ratings change.
By category
More about category tags
The English Grammar tree breaks topics down by grammatical category, from determiners to verb tenses and everything in between. Our taxonomy overview explains how we organized it all. The categories are not set in stone. We keep refining them to make them as useful as possible.
CEFR stands for the Common European Framework of Reference for Languages, a widely used standard for benchmarking language ability from beginner (A1) to mastery (C2).
Difficulty levels reflect the content authors' judgment of how challenging each question is, so you can start easy and work your way up.
What's New
November 8, 2026: New challenges
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Capital Letters Inside the Sentence Is it Diwali or diwali, the Festival or the festival? Practice capital letters for festivals, faiths, languages, seasons, and directions with Diwali stories from India, Nepal, Singapore, Trinidad, and Toronto.
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Sound-Alike Words at Work: Lose, Than, Advise, and More "Please advice me" and "testing is apart of the plan" both pass spell-check. Can you catch them? Practice ten sound-alike pairs that slip into work messages, from lose / loose to complement / compliment.
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Polite Reminders and Follow-Ups Are you worried about sounding rude when asking someone to reply to your email? Master the art of polite follow-ups, softening language, and friendly reminders for both workplace and social situations.
November 1, 2026: New challenges
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Direct and Indirect Questions in Workplace Messages Have you ever sent a quick message to a colleague and realized your grammar was a little off? Master workplace communication by practicing direct question word order, indirect questions, polite requests, and tricky adverbs like also and still.
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Common Preposition Mistakes in Work Messages Do you ever wonder if you should "discuss the menu" or "discuss about the menu"? Master professional communication by fixing common mistakes with verbs that take no preposition, matching nouns with specific prepositions, and choosing the right forms of regarding and reply to.
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Workplace Prepositions: In, On, At, By, and Until Are you on a meeting or in a meeting? Master the tricky differences between in, on, at, by, and until when talking about digital platforms, documents, and project deadlines at work.
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Apostrophes at Work: Contractions, Possessives, and Plurals Ever panicked after sending an email with an embarrassing typo? Master the rules for contractions, singular and plural possessives, time possessives, and plural acronyms to keep your work messages perfectly punctuated.
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Work Compounds: Verbs, Nouns, and Hyphenated Modifiers Ever wonder whether you should "set up" a meeting or "setup" a meeting? Master the tricky spelling of phrasal verbs vs. nouns, hyphenated compound modifiers, and open compounds in everyday workplace messages.
October 31, 2026: Site update
- GrammarError Is Smoother on Your Phone We've improved the site on phones: pages load faster, buttons are easier to tap, everything fits the screen, and you can add GrammarError to your home screen like an app. Find your level with the free CEFR level test (A1–C2), practice by grammar topic with 300 tagged challenges, and track your strong and weak topics as you go.