很简单的哟：单三用has,非单三用have，例如，你最熟悉的句型，She has a lovely dog.I have a pen.还有用在现在完成时态中，例如，I have been to Shanghai.Has he eaten lunch?等等。
明白了吗？祝你进步！
Has 用于第三人称单数现在时
The company has no appetite for any new project nowadays. (喻)
现时公司没有兴趣去接受任何新工程。
The young boy has aspirations to become a famous surgeon.
"这男孩很有抱负,要当一名著名的外科医生。"
My neighbour is a quiet young fellow and has a capacity for enjoying himself.
"我的邻居是个文静的小伙子,他能够自得其乐。
单数第三人称用“has”
第一人称，第二人称和第三人称复数用“have”
第三人称单数用has
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