Your Guide to English Grammar
Make mistake-free writing your superpower. Learn the rules of grammar, then use RewriteMate's AI keyboard to polish your writing in any app — Messages, Mail, Notes, Slack, and more.
AI keyboard for iOS and macOS. Free to try.
Free Online Grammar Checker
Fix any punctuation, grammar, or spelling errors with a single click. RewriteMate's AI-powered writing assistance helps ensure your writing is spotless.
What is Grammar?
Grammar is a set of language rules that allows you to combine individual words to make different meanings. Your writing is stronger, clearer, and more effective when you follow grammar rules. Learn more about the principles of grammar and see how polished writing is brilliant writing.
Parts of Speech
Every word in English belongs to one of eight categories. Understanding them is the foundation of good grammar.
Nouns
People, places, things, or ideas (cat, city, freedom)
Verbs
Actions or states of being (run, is, have)
Adjectives
Describe nouns (blue, tall, delicious)
Adverbs
Modify verbs, adjectives, or other adverbs (quickly, very)
Pronouns
Replace nouns (he, they, it, who)
Prepositions
Show relationships in time/space (in, on, at, between)
Conjunctions
Connect words or clauses (and, but, because)
Interjections
Express emotion (wow, oops, hey)
AI Writing Assistance That Makes Your Words Shine
Submit your best work with proper grammar and impeccable word choice. RewriteMate makes mistake-free writing easy with AI-powered rewriting, tone adjustment, and translation — all from your keyboard.
Frequently Asked Questions
What is grammar?▾
Grammar is the set of structural rules that govern the composition of clauses, phrases, and words in a language. It includes parts of speech, punctuation, sentence structure, and spelling conventions.
How can I check my grammar for free?▾
Use RewriteMate's free online grammar checker above. Paste your text and click Check Grammar to get instant corrections with explanations. No sign-up required.
How does RewriteMate help with grammar?▾
RewriteMate is an AI keyboard for iOS and macOS that checks grammar, fixes spelling, adjusts tone, and rewrites sentences — directly inside any app. You don't need to switch to a web editor.
Is RewriteMate free?▾
Yes. RewriteMate has a free tier with powerful built-in commands including proofreading, paraphrasing, tone adjustment, and translation. Upgrade to Pro for unlimited rewrites and custom commands.
Does RewriteMate work on iPhone and Mac?▾
Yes. RewriteMate is available as a keyboard extension on iOS and a menu bar app on macOS. It works in every app — Mail, Messages, Notes, Notion, Slack, Safari, and more.
