"buy"的适当形式取决于句子的时态和主语的人称。以下是"buy"的不同形式及其用法：
原形（Base Form）
用于祈使句或情态动词后：
Buy some food.
You should buy a gift for her.
第三人称单数（Third Person Singular）
用于一般现在时，主语为第三人称单数（he, she, it）：
He buys a car every year.
She buys milk on her way home.
现在分词（Present Participle）
用于进行时态：
They are buying a new house.
She is buying clothes for the party.
过去式（Past Tense）
用于一般过去时：
He bought a book last week.
They bought a new apartment last year.
过去分词（Past Participle）
用于完成时态或被动语态：
The book was bought by him.
They were bought presents for the celebration.
根据以上信息，"buy"的适当形式可以根据句子的语境和时态进行选择。
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