I left mine at home.为什么这里要用left

I left mine at home.为什么这里要用left No it is Helen. l left mine at home.为什么用mine而不用my呢 I left m at home It isn't_____watch.I left mine at home.A.me B.my C.I D.mysel I was left alone at home.为什么是was left alone以及句子意思 I your math book at home.空的地方为什么要填left啊? I left\forgOt my book at home. i （left） it at home I left my wallet at home I've __ my keys at home.为什么用left?left不是 短暂性动词吗..为什么可以用于现 Do you know when he left?这里为什么用left I am a( )I have left my key at home