10 Common Grammar Mistakes in Business Emails (and How to Fix Them Instantly)

1. Its vs. it's

Its shows possession ("the company updated its policy"). It's is short for "it is" or "it has." Mixing these up is one of the most common — and most noticed — errors in professional writing.

2. Your vs. you're

Your shows possession. You're means "you are." "Your welcome" instead of "you're welcome" is a classic slip that undercuts an otherwise polished message.

3. Comma splices

Joining two complete sentences with just a comma ("The report is ready, I'll send it over") reads as rushed. Use a period, a semicolon, or a conjunction instead.

4. Dangling modifiers

"After reviewing the proposal, the budget seemed too high" implies the budget did the reviewing. Make sure the subject right after an introductory phrase is the thing actually doing the action.

5. Subject-verb agreement across long sentences

The longer the sentence, the easier it is to lose track of whether the subject is singular or plural by the time you reach the verb — especially with phrases like "the team, along with its partners, is/are..."

6. Inconsistent tense

Switching between past and present tense mid-paragraph ("We reviewed the data and we're finding...") reads as unpolished even when every individual sentence is grammatically fine on its own.

7. Overusing exclamation points

Not strictly a grammar error, but a common professional-tone mistake — excessive exclamation points can undercut credibility in formal business contexts.

8. Missing the Oxford comma inconsistently

Whichever style you pick, using it inconsistently within the same document (or even the same email) reads as sloppy. Pick a convention and stick to it.

9. "Could care less" instead of "couldn't care less"

A common misstatement that actually reverses the intended meaning — "could care less" implies you do care somewhat.

10. Run-on sentences from over-editing

Emails that get revised multiple times before sending often accumulate clauses until the sentence loses its shape. If a sentence needs more than one comma to hold together, it's usually a sign to split it in two.

The fastest fix: catch it before you send, not after

Most of these mistakes are invisible on a quick self-read because you already know what you meant to say. A one-click correction pass — rather than relying on catching it yourself — is the more reliable habit, especially for anything time-sensitive where you don't have time for a careful proofread.