it isn't fair和it's not fair的区别哪个对?哪个比较常用?

it isn't fair和it's not fair的区别哪个对?哪个比较常用? It isn't fair的汉语 the world is not fair ..isn't it? it's not my...和 it isn’t my. it's not和it isn't有什么差别? it isn't =it's not It's not = It isn't it's not fair it‘s not fair it's not.fair Why?I can't belive it!It isn't fair!的意思 It isn't=It is It's not=It is It isn't=It's it isn't和it's not的区别看好了 是it isn't和it's not 请教一下 谢谢 It`s cold today,isn`t? lt's smart sweater,isn't it? it's not you,is it?和it's you,isn't it?的意思一样么?有什么区别? No,it isn’t.和 It is not.No,it isn’t.和It is not.It is not Bill’s dictionary.能不能改成 it isn’t Bill’s dictionary.可不可以呢,若可以为什么呢? It'S Not Fair 歌词