Well, let's think about it like a happy little tree. The correct phrase is "He has an appointment." Remember, when talking about a singular person, we use "has" instead of "have." Keep practicing, and soon it will flow as smoothly as paint on a canvas.
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Well, honey, the correct way to say it is "He has an appointment." "Has" is the third person singular form of the verb, so it agrees with "he." "Have" would be used with "I," "you," "we," or "they." So, there you have it, darling.