The most common use of the semicolon is to join two independent clauses without using a conjunction like and. However, semicolons are not interchangeable with commas or periods. Capital letter is not used after semicolon except the word is a proper noun or an acronym.
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You can use a semicolon to join two closely related independent clauses. A sentence that comes before the semicolon and the sentence that comes after the semicolon should share a close, logical connection.
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A semicolon is not the only thing that can link two independent clauses. Conjunctions can do that too. However, a semicolon and a conjunction should not be used together. That means semicolons is used in place of conjunctions (and, or, but), so both cannot come together.
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You can use semicolons to divide the items of a list if the items are long or contain internal punctuation. In these cases, the semicolon helps readers keep track of the divisions between the items.
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When you have a conjunctive adverb linking two independent clauses, you should use a semicolon. Some common conjunctive adverbs include moreover, nevertheless, however, otherwise, therefore, then, finally, likewise, and consequently.
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