The sentences which use commas correctly are statements 3, 4, and 5.
Commas and periods are the two most frequently used punctuation marks in a sentence. Generally, commas indicate a brief pause and are not as final as a period. Commas are used to separate independent clauses, after an introductory clause, phrase, or word before the main clause, between all items in a series, to set off nonrestrictive clauses, to set off appositives, to indicate direct address, to set off direct quotations, and to set off all geographical names, items in dates (except the month and day), addresses (except the street number and name), and titles in names. Hence, based on the common rules applicable to use of commas, the correct statements are 3, 4, and 5.
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