请英语大神们看看我这两句话

问题描述:

请英语大神们看看我这两句话
This stuff will be disposed of as garbage.
Can u exchange your clother with him.
第一句as前面的of可以去掉吗,第二句最后是用him还是物主代词his啊?

第一句去掉of 第二句用him