When is the English party going to be held is still a problem.这句话错在哪?

问题描述:

When is the English party going to be held is still a problem.这句话错在哪?
为什么?这应该是个什么从句?

主语从句 应该改成when the English party going to be held is still a problem.因为在主语从句中从句部分要用陈述语序