This case doesn't belong to me!这句中to起到什么作用?

请教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 This case doesn't belong to me!这句中to起到什么作用? Doesn'T Have To Be This Way 歌词 It doesn't have to be this way的汉语 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 this radio doesn't work this doesn't always happen This __ (be not)my 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? Doesn't have to be this way啥意思 在线翻译译成 “并不一定是这样”对不? this+doesn't+seem+to+be+a+valid+FL+studio+folder是什么意思 Be careful of this dog which doesn't bark.这句话有错误吗? 帮忙翻译一句话 We don’t want to go on a tangent why this has to be the case 英语翻译We have looked at the sent photos intensively.Our first opinion is the result that there doesn't exist any oil leakage.We think in this case it is a mixture of grease and dirt which can be seen on the sealing sleeve (hardened dirt parts). this signal doesn't support in this country.这么写对不?应该用个被动形式.this signal doesn't be supportted in this country.可是读着有些别扭.更好的写法是什么样的? It doesn't matter this time. i doesn't like this colour.改错