is this your case 语法错误吗?为什么我学新概念一的时候 有一句话 这是你的箱子吗？文章中的翻译is this case yours?我不解这种用法？用Is this your case

is this your case,is this case yous这两种语法有没有错误 Is this your pencil case中文 Exuse me!Is this your pencil case?改为复数形式 is this a pen ___ your pencil case This is a new pen.( ) it in your pencil case Is this your watch in the lost and found case?怎么翻译?特别是case Ok,and this is my book and this is your pencil case ,Jane. 连词成句 notebook your this is in lost found ang case theoh，no。搞错了应该是notebook your this is in lost found and case the OK.and this is my book.And thr is your pencil case Jane This is his pencil case. is this your case 语法错误吗?为什么我学新概念一的时候 有一句话 这是你的箱子吗？文章中的翻译is this case yours?我不解这种用法？用Is this your case what ( )is your pencil case? notebook your this is in lost found and case the 连词成句 is this your pencil case?___a 、yes,it's b 、no,it isn't notebook, your,this,is,in,last,found,and,case,the.连词成句是什么? Is this your ID card in the lost and found case?如何翻译? watch,your,this,is,in,lost,found,and,the,case 把这些词组成句子 me,escuse,is,this,case,your,连词成句中文翻译是