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HESI GrammarComma, semicolon, colon, apostrophe

Punctuation RulesHESI A2 cheat sheet

Comma, semicolon, colon, apostrophe

6 key facts 3 practice questions Reviewed Oct 2026
The 1-minute sheetCinnaEntry

Comma

  • Lists, after an introductory element, before FANBOYS joining clauses
  • Around nonessential information only

Semicolon

  • Joins two closely related independent clauses

Colon

  • Introduces a list or explanation; needs a complete sentence before it

Apostrophe

  • Possession and contractions only — never to form a plural
  • its possessive vs it's = it is
Key takeaway

Comma, semicolon, colon, apostrophe

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Which of the following is a run-on sentence?

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