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Summary: To use a comma to combine sentences, follow the comma after the first independent clause with one of the seven coordinating conjunctions, which include and, but, or, nor, for, so and yet. Find out when to use a comma when combining sentences with grammar help from a creative writing instructor in this free video on writing.
Heather Kamins has a Master of Fine Arts in creative writing from Mills College in Oakland, Calif. She has taught and tutored English composition at Mills, as well as at the College of...read more
"Hi, I'm here to tell you about when to use a comma to combine sentences. If you have two complete sentences that are related in some way. Whether it's a cause and effect relationship. Or it's a comparison or contrast. You can combine those into one sentence. By using a comma. And a Coordinating Conjunction. There are seven Coordinating Conjunction which are and, but, or, nor, for, so and yet. So here's an example of how to combine two sentences into one. Here you have two complete sentences. Each with a subject and a verb. Mike drove to the library. His car broke down on the way home. Now because those ideas are connected. You can connect the sentences with a comma and a Coordinating Conjunction. You do want to be careful. That you don't want to accidentally connect with a comma and a Coordinating Conjunction. Something that's not a complete sentence. So here you have a subject. But both of these verbs refer to the same subject. So this, read a book about China. Doesn't stand on it's own as a complete sentence."
eHow Article: When to Use a Comma to Combine Sentences