this has not been easy与this is not easy区别

this has not been easy与this is not easy区别 This has not been easy 和 this is not easy 不是一个意思吗 this has not been easy.中has not been什么意思?怎么来的?具体点 This has not been easy because i own over a thousand books.这 新概念二册 的52课：This has not been easy This has not been easy because I own over a thousand books. 英语翻译this has not been easy because i own over a thousand boo this is not been easy 帮我分析一下这句话 This question is more____(not easy)than that one. sports,us,easy,is,this,not,for连词成句 我想请问你一下新概念二52课中 This has not been easy because i own over a （ ）is not easy