Peter is at home today.把at home划线,问皮特在哪,用英语怎么说.

画线提问嘛
at home 是一个地点状语,对地点状语提问用where,所以是：
Where is Peter today?
如果画线部分是today,对时间状语提问,就写成：
When is Peter at home?
如果画线部分是Peter,就是对主语提问,就写成：
Who is at home today?
另外,对名词提问,人就用Who,物就用What
够详细了吧?