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Coordinating conjunctions serve as connections within a sentence. The coordinating conjunctions in English are For, And, Nor, But, Or, Yet, So. An independent clause is part of a sentence that has its own subject and verb. It can stand on its own as a sentence. You should always use a comma when a FANBOYS conjunction connects two independent clauses. Here is an example of a FANBOYS conjunction connecting two independent clauses: "I checked out three books from the library, but now I find it impossible to read them all." If you removed the conjunction, each clause would stand as its own sentence. This conjunction does not connect two independent clauses: "Bai discovered he had everything he needed but a pencil." The last part of the sentence cannot stand on its own. The presence of a conjunction does not necessarily require a comma. Only independent clauses need to have the comma between them. For example, if your sentence joins only two words with a conjunction, do not use a comma: "Give me all the bacon and eggs you have." If your sentence uses "for" as a preposition to join a dependent clause, do not use a comma: "I'm saving money for a Hawaiian vacation." If your sentence uses "so" to emphasize another word, do not use a comma: "The teacher was so tired of grading bad essays." If your sentence uses "so" in the phrase "so that," do not use a comma: "Elena knew that she should eat her breakfast so that she would not be hungry later."
Use FANBOYS to help you remember the coordinating conjunctions. Use commas before coordinating conjunctions that link independent clauses. Pay attention to the grammar of the sentence.