my pencil is in my home和mine is at home那个对?为什么?

my pencil is in my home和mine is at home那个对?为什么? No it is Helen. l left mine at home.为什么用mine而不用my呢 My mother is at home now.(对at home提问) My mother is at home. My father is the tallest at home.这个句子的at可以改成in吗 为什么? In the evening,my family _____ at home.A.is This is a picture in my famliy at home.改错 in my home和at my home哪个正确? at my home 和in my home有什么区别 My watch is __.A.at here.B.in home C.at home.__to the Englis My mum is at home（对画线的部分提问）画线部分是at home where is my purse it at home