If the letter to be mailing was placed on the writing table an hour ago,it is certain being there no

题目

If the letter to be mailing was placed on the writing table an hour ago,it is certain being there now.
In the long run,however,this hurry to shed full-time staff may be more harmful to industry as it is to the workforce.
两句各有一个错误,请分析详细一些非常感谢.

答案

mailing改为mailed,信件被邮寄,用被动语态
as改为than,比较级用more...than...,或者把more改为as