中学英语语法问题

问题描述:

中学英语语法问题
I am not sure what is he talking about.
I am not sure what he is talking about.
Which one is correct and please give your reasons.
是不是从句部分都是用陈述句的正常语序?

第二句是正确的
类似这种从句后边要用陈述语气,
what作talking about 的宾语,意思是我不确定他正在说什么.