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Common Grammar Mistakes

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Errors to Watch For


Their/There/They're


Their: possessive (their car). There: location (over there). They're: contraction of "they are."


Your/You're


Your: possessive (your book). You're: contraction of "you are."


Affect/Effect


Affect: verb meaning to influence. Effect: noun meaning result. Exception: "effect" as a verb means to bring about ("effect change").


Who/Whom


Who: subject (who wrote this?). Whom: object (to whom did you speak?). Trick: if you can answer with "him," use "whom."


Dangling Modifiers


Wrong: "Walking down the street, the trees were beautiful." (Trees aren't walking.)


Right: "Walking down the street, I noticed the beautiful trees."


Run-On Sentences and Comma Splices


Two independent clauses need proper connection: a period, semicolon, or conjunction with a comma. Never join them with just a comma (comma splice) or nothing at all (run-on).