And is this my sister, Amy?这句话有点让人费解,因为问话人需要确认是否是姐妹。最有可能的意思是:那这位是我的姐姐(妹妹)艾米吗?
and is this my sister,amy这是我的妹妹,艾米
and is this my sister,amy?这是我妹妹艾米吗?
And is this my sister,Amy?这是我妹妹艾米吗?