Give me a "raisin"

Mommy says we should let people know how much improvement I've made on English, and mommy says this is a good example:

Aaron: Come downstairs, mommy
Mommy: Why?
Aaron: 下楼，mommy!
Mommy: Why? give me a reason
Aaron: 嗯。。。？ 你要吃葡萄干？
Mommy: ？？？？
Aaron: 我们学校葡萄干就叫raisin