Thsae are his brothers(变单数形式) That's his friend(变复数形式) Is this your sister?(做否定回答) Those are my friends,(变单数形式)

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Thsae are his brothers(变单数形式) That's his friend(变复数形式) Is this your sister?(做否定回答) Those are my friends,(变单数形式)

This is his brother.Those are his friends.No,she isn't This is my friend.