What are the most common grammar mistakes to avoid?

The top offenders are confusing its/it's, their/there/they're, and affect/effect, plus subject-verb agreement slips in long sentences with a plural noun buried between the subject and verb. Comma splices and dangling modifiers show up constantly too, especially in fast writing like emails, where a sentence gets sent before you reread it.

How do I check if a sentence is grammatically correct?

Read it aloud first. Your ear catches awkward phrasing that your eyes skip past. Then check three things in order: does the subject match the verb in number, does every pronoun clearly point to one noun, and is the punctuation placed where the pause belongs. A grammar tool automates this same sequence.

What are the basic rules of English grammar?

Ten rules cover most of it: subject-verb agreement, correct pronoun case, consistent verb tense, parallel structure in lists, proper modifier placement, correct article usage, subject-verb-object word order, capitalization rules, apostrophe usage for possession versus contraction, and comma placement around clauses. Master these ten and you catch the majority of everyday writing errors.

Can AI tools check grammar as well as human editors?

AI catches mechanical errors, punctuation, subject-verb agreement, and spelling, with high consistency. Human editors still win on judgment calls: whether a sentence fits the tone of the piece, whether a word choice lands with the audience, and whether a paragraph needs restructuring rather than a comma fix.

What is the difference between grammar and style?

Grammar covers rules that determine whether a sentence is structurally correct. Style covers choices between equally correct options, like whether to use the Oxford comma or how formal your vocabulary should be.

Should I use strict or casual grammar checking?

Use strict checking for academic papers, legal documents, and formal business writing. Casual checking works better for emails, social media, and creative writing where rigid rules would stifle your voice.

How does this grammar checker handle different English dialects?

Select your [LANGUAGE] variant and the checker applies region-specific rules. British English uses different spelling (colour vs color, realise vs realize), different punctuation placement around quotation marks, and treats collective nouns like 'team' or 'staff' as plural where American English treats them as singular.

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Prompt Library WritingGrammar Checker

Grammar Checker

Find and fix grammar, spelling, punctuation, and style errors with detailed explanations and suggestions for clearer writing

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Prompt Template

You are a meticulous editor with expertise in English grammar, punctuation, spelling, and style. You have trained countless writers to improve their craft by explaining not just what to fix, but why each correction matters. Your approach is thorough yet encouraging, treating every piece of writing as an opportunity to help someone communicate more effectively.

I need you to check and improve the following text.

Language variant: [LANGUAGE:select:American English,British English,Australian English,Canadian English]

Strictness level: [STRICTNESS:select:Casual - fix only clear errors,Standard - fix errors and awkward phrasing,Formal - fix everything including style issues,Academic - enforce strict formal conventions]

Focus areas: [FOCUS:select:All issues,Grammar and spelling only,Punctuation and clarity,Style and flow,Sentence structure]

Here is the text to check:

---

[TEXT_TO_CHECK]

---

Your analysis must cover five areas in this order:

1. Critical errors - spelling mistakes, subject-verb disagreement, incorrect verb tenses, wrong word usage (their vs there vs they're, its vs it's, affect vs effect), and missing or misplaced punctuation that changes meaning

2. Clarity issues - run-on sentences, sentence fragments, misplaced modifiers, unclear pronoun references, and passive voice that obscures the actor

3. Style improvements - redundant words, weak verb choices, inconsistent tone, wordiness that could be trimmed, and repetitive sentence structures

4. Punctuation refinements - comma splices, missing Oxford commas (if using American English), incorrect semicolon or colon usage, and quotation mark placement

5. Overall assessment - a brief summary of the writing's strengths and one or two patterns the writer should focus on improving

For each issue you find, provide the original text, your suggested correction, and a one-sentence explanation of why this change improves the writing. Group related issues together rather than listing them in the order they appear. If the text is mostly correct, acknowledge that before noting minor refinements.

Format your response with clear section headings. Use strikethrough for original errors and bold for corrections when showing before and after. If no issues exist in a category, state that clearly rather than forcing feedback.

After your analysis, provide the fully corrected text in a code block so it can be copied directly.

Variables
4

Languageselect

Strictnessselect

Focusselect

Text To Checktext

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About Grammar Checker

Spellcheck catches typos. It won't catch a sentence where the modifier attaches to the wrong noun and reverses your meaning, or a comma splice that reads fine to you because you already know what you meant to say. The errors that confuse readers are rarely the ones spellcheck flags.

Paste your [TEXT_TO_CHECK] and pick a [STRICTNESS] level, from casual (fix only clear errors) up to academic (enforce every formal convention). Set [FOCUS] if you only want punctuation checked, or sentence structure, or everything at once. Select [LANGUAGE] and the checker applies the right spelling and comma conventions for American, British, Australian, or Canadian English, since 'colour' isn't a typo everywhere.

Once the grammar is clean, send any run-on sentences to the run-on sentence fixer, or clean up incomplete sentences with the sentence fragment fixer. Those need restructuring, which is different work than a grammar fix.

Check your draft in the Dock Editor before you send it, publish it, or turn it in.

How to Use Grammar Checker

Select your language variant

Select your language variant from [LANGUAGE] options like American English, British English, or Australian English.

Set your strictness level

Choose your [STRICTNESS] level from casual to strict based on whether the writing is informal or professional.

Pick a grammar focus area

Pick a [FOCUS] area such as punctuation, subject-verb agreement, or word choice to prioritize specific error types.

Paste your text and review corrections

Paste your text into [TEXT_TO_CHECK] and review the annotated corrections with grammar rule explanations.

Who Uses Grammar Checker

Academic Papers

Check research papers and essays for formal grammar compliance before submission to journals or professors

Business Communication

Review emails, proposals, and reports for professional grammar that builds credibility with clients and colleagues

ESL Writing Support

Get detailed grammar explanations that help non-native English speakers understand rules while improving their text

Content Publishing

Catch grammar errors in blog posts, newsletters, and marketing copy before they reach your audience

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