Is she younger than Amy?一般陈述时变为疑问句有BE 动词的 吧BE动词提到句首即可没有BE动词，借助于助动词，再把句子放到助动词后面
Is she younger than Amy?一般疑问句就是将is提于主语前，回答用Yes或no
Is she younger than amy? 希望能帮到您
Is she younger than amy?
