some students 改为名词所有格形式.

问题描述:

some students 改为名词所有格形式.

some studetns'应该是students吧对,手误,打错了,不好意思没关系请问一下,my lost pen is in the lost and ( )came.应该写什么found
最后一个单词是case额额,谢谢