A. The reason I'm late is that the bus broke down. <br/><br/>B. The reason I'm late is because the bus broke down.<br/><br/>Why is A correct? <br/><br/>A. The show, which was on after dinner, was great.<br/><br/>B. The show, that was on after dinner, was great.<br/><br/>Why is A correct?<br/><br/>A. The door that was on the left was the correct one.<br/><br/>B. The door which was on the left was the correct one.<br/><br/>Why is A correct? <br/><br/><br/>How to use "that" as a conjunction?