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This fun and interactive exercise will give you practice identifying two common types of run-on sentences: comma splices and fused sentences. For each practice item, you must identify whether a run-on sentence is a comma splice or a fused sentence. After every response, you will get immediate feedback. Explanations of each correct answer are also provided. There’s also an explanation of the rules of proper sentence structure for you to study, simply click the hyperlinked word "rules."