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Question问：
"Mary has many cows on her farm." or "Mary have many cows on her farm." Which one is correct? 哪一个是正确的？
Answer答：
Use "has" because "Mary" is a third person singular subject: Mary has many cows on her farm.
使用“has”，因为“Mary”是第三人称单数主语:Mary在她的农场上有许多头奶牛。
Mary is the subject of the sentence, and has is the verb. The verb must agree with its subject. In the simple present has should be used with a third person singular subject (Mary, Jim, he, she, it, the book, a cat, etc.), and have should be used in all other places. Below is a chart showing when to use has and when to use have.
玛丽是句子的主语，has是动词。动词必须与主语一致。在一般现在时has应该与第三人称单数主语连用(Mary, Jim, he, she, it, the book, a cat，等等)，have应该用于所有其他地方。下面的图表显示了什么时候使用has，什么时候使用have。
