Final answer:
The antithesis in a sitcom usually appears in the middle of each episode and is a literary device that involves contrasting ideas or words.
Step-by-step explanation:
The antithesis in a sitcom is usually found in the middle of each episode. It is a literary device that involves contrasting ideas or words to create a dramatic or comedic effect. This can be seen in the form of a conflict, contradiction, or juxtaposition between characters, situations, or dialogue. For example, in a sitcom, the antithesis may be evident when two characters with opposite personalities argue or when a character's actions contradict their words.