[典例剖析] 按要求完成句子。
This is my little brother's toy elephant.（对画线部分提问）
toy elephant ?
点拨 画线部分是第三人称单数的名词所有格形式，表示物品的所属关系，应用特殊疑问词whose来提问。故填Whose, is this。

()— skirts are these? — Sarah's.

A.Where; They're
B.Whose; It's
C.Whose; They're