Grammar Mistakes That Make You Look Unprofessional

You don't need to be a grammarian to write professionally. But there are a handful of mistakes that readers — consciously or not — associate with carelessness. Here are the ones that matter most.

Its vs. It's

"It's" is always "it is" or "it has." "Its" is possessive: "The company updated its policy." This is the most common mistake in professional writing.

Their / There / They're

These sound identical and mean entirely different things. Spell-checkers often miss them because all three are correctly spelled words. AI grammar checkers, which understand context, catch them reliably.

Fewer vs. Less

"Fewer" applies to countable things (fewer meetings). "Less" applies to uncountable quantities (less time). Mixing them sounds informal in business writing.

Subject-verb agreement in long sentences

"The team of senior engineers are working on it" — the subject is "team" (singular), so it should be "is working." Long phrases between subject and verb confuse the issue.

Comma splices

Joining two independent clauses with just a comma is a comma splice: "The report is ready, please review it." Use a semicolon, a conjunction, or make them separate sentences.

The solution isn't to memorize grammar rules — it's to use a real-time writing assistant that catches these as you type.