Do not join independent clauses by a comma. If two or more clauses, grammatically complete and not joined by a conjunction, are to form a single compound sentence, the proper mark of punctuation is a semicolon. Stevenson's romances are entertaining; they are full of exciting adventures. It is nearly half past five; we cannot reach town before dark. It is of course equally correct to write the above as two sentences each, replacing the semicolons by periods. Stevenson's romances are entertaining. They are full of exciting adventures. It is nearly half past five. We cannot reach town
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