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请帮我写一下5个主系表结构的词,要用第三人称单数做做主语,

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请帮我写一下5个主系表结构的词,要用第三人称单数做做主语,
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答案和解析
He is a boy.
He isn't a boy.
She is a girl.
She isn't a girl.
It is a dog.