i know who the thief is.i know who is the thief.哪个对?为什么?

问题描述:

i know who the thief is.i know who is the thief.哪个对?为什么?

I know who the thief is
这个正确 因为整个句子是陈述的 所以is要放在最后的
后边的这个 who is the thief是疑问句 不能加在陈述句中