The workers didn't find out what was the matter with the machine 这句话对吗/不对如何改正?

问题描述:

The workers didn't find out what was the matter with the machine 这句话对吗/不对如何改正?
The workers didn't find out what was the matter with the machine 这句话对吗/不对,如何改正?如果"what is your trouble "作宾语从句如何处理?

The workers didn't find out what was the matter with the machine 这句话不对,应修改成
The workers didn't find out what the matter with the machine
what is your trouble "作宾语从句应写为what your trouble is?