看下这句This case doesn't belong to me为什么不是This case isn't belong to me

看下这句This case doesn't belong to me为什么不是This case isn't belong to me 请教This case doesn't belong to me为什么不是This case isn't belong to me This case doesn't belong to me!这句中to起到什么作用? Do与Does的区别?This case doesn't belong to me.This case don't belong to him.Do与Does的区别?This case doesn't belong to me.This case don't belong to him.我知道Does是第三人称单数用的形式,其他形式用do.为什么第一话用的 in this case求翻译, This is his pencil case. This case doesn't(/isn't) belong to me!这个箱子不属于我!This case doesn't(/isn't) belong to me! 这个箱子不属于我!问：如果换成括号里的isn't对吗? ,如果不对是为什么呢?.什么情况可以用isn't? this radio doesn't work this doesn't always happen W_______pencil case is this.并翻译 Is this your pencil case中文 this is his pencil case 复数句 This __ (be not)my pencil case 有没有in this case的词组? whose is this red case意思是什么? 求翻译短语,In this case, This pencil-case is five and ten. 英语短语:____ this case加上中文翻译,