Lucy and Lily ______ sister.They study in the same school.(2009北京市)

分类: 作业答案 • 2021-12-01 16:51:13

问题描述：

Lucy and Lily ______ sister.They study in the same school.(2009北京市)
答案是are,为什么这里sister不加s?

答

因为原句中,Lucy and Lily are sister,应该被理解为她们的姐妹关系相对于对方而言的.
我这样说可能你就明白了：
Lucy is Lily's sister; lily is lucy's sister,
所以就不用加“S”了.