- Do not use one mark when two are needed to
enclose some element.
- Do not use commas where a semicolon or a
period is required:
- Between independent
clauses with no conjunction joining the clauses (such sentences are called "comma splices")
- Between independent
clauses joined by conjunctive adverbs
- Between two
independent clauses containing internal punctuation but joined
by a simple conjunction.
- Do not use commas to separate two words,
two phrases, or two dependent clauses joined by a simple conjunction
(usually "and'').
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