We frequently create run-on sentences because we believe the words are connected and that separating them with a period doesn't seem acceptable. For example, if we wrote, "She enjoyed skiing, but he didn't," we'd have a comma splice. However, since periods are used to separate sentences, leaving out the punctuation makes our sentence sound wrong. The most common cause of the run-on sentence is using too many subjects or verbs. If you do this, sometimes it can be fixed by adding a few more objects or switching some of the subjects or verbs around. For example, instead of saying, "I like my job, my coworkers, and my boss," say, "I like my job. My coworker is helpful and my boss is understanding." Another cause for the run-on sentence is using phrases rather than complete thoughts. For example, instead of saying, "I like eating ice cream every day at noon," say, "Eating ice cream at noon is one of my favorite things about living in Arizona." Finally, a run-on sentence may also result when there is a lack of coordination between the subject and verb. For example, instead of saying, "I like skydiving, swimming, and camping," say, "Skiing is my favorite sport because it's exciting and challenging. I also enjoy swimming and camping."