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GrammarVista.com USA: practical American-English grammar guide.

What GrammarVista.com USA is, who it is for, how we research and check every grammar guide, and how we correct mistakes.

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Clear American-English grammar rules with real examples: subject-verb agreement, pronouns, tenses, modifiers, run-ons and the old “rules” you can safely ignore.

Commonly confused words explained fast: affect vs. effect, its vs. it’s, who vs. whom, lay vs. lie and dozens more sound-alikes, each with a memory trick.

American punctuation made simple: commas and the Oxford comma, apostrophes, semicolons, colons, quotation marks and dashes, with wrong-and-right examples.

What text slang and abbreviations really mean, from LOL and SMH to NGL, IYKYK and no cap, plus when slang fits at work, at school and online.

American vs. British English side by side: spelling, vocabulary, grammar, punctuation and date formats, so your writing stays consistently American.

Grammar tips, proofreading checklists and writing advice from the GrammarVista.com USA editorial team: short, practical reads for everyday American writing.

Grammar checkers catch typos fast, but they miss correctly spelled wrong words and flag sentences that are fine. Here's how to combine…

A simple, repeatable method for catching typos, real-word errors, punctuation slips, and agreement mistakes in emails and essays before anyone else sees…

Americans write October 16, 2026, not 16 October 2026. Learn the commas, numeric formats, ordinals, and US vs UK differences that keep…

Workplace chat is more casual than ever, but slang that works with a teammate can backfire with a client. Here is how…

One tiny apostrophe changes the meaning completely. Here is the one-second test that tells you which spelling you need, every single time.

The Oxford comma is one small mark with a big fan club and a few critics. Here is what it does, who…

You lay something down, but you lie down yourself. The rule is simple; the past tense is what makes it messy. This…

Who does the action; whom receives it. One quick substitution test settles almost every case, and it also tells you when you…

Most of the time, affect is the action and effect is the result. Here is the simple rule, the exceptions that trip…

Americans and Brits share a language, but not a style sheet. Here's how the two differ in spelling, vocabulary, grammar, and punctuation,…

From LOL to "it's giving," here is what common American text slang means, how it works in a sentence, and when it…

How Americans punctuate, mark by mark: when to use each one, where it goes with quotation marks, and what AP, Chicago, and…

Spell-check won't save you from "your welcome" or "less mistakes." Here are the word pairs that trip up careful writers, with plain…

The core rules people actually get wrong, explained in plain English with real example sentences you can copy, check, and trust.

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Our guides explain mainstream American-English usage. Here is what that means for how you use them.

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