Once upon a time, I wrote an essay. It rained, of course, while I was walking to the store . are used before closing phrases that add non-essential, modifying extra information. 2. are used when no coordinating conjunctions join the clauses. are used instead of commas when the series consists of long, complex phrases and when the sentence on the whole is very long and complex. Parentheses are used only around the entire compound sentence.
Period is placed outside of closing mark.
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