Mary is your good friend玛丽是你的好朋友
陈述句变一般疑问句 把be动词（is am are）放到句首就行了
Is Mary your good friend? 否定就在be动词后加not
Isn't Mary your good friend?
Mary is your good friend, isn't she?
Mary is not your good friends?
Isn't Marry your good friend
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