"i dont know who is the boy" & "i dont know who the boy is" which one is correct

问题描述:

"i dont know who is the boy" & "i dont know who the boy is" which one is correct
Please give detailed explaination ,thank you very much .

第二个正确,因为所有的从句中,语序都用陈述语序.如I dont know who you are.Thank you ,But some times i got confuse , for example :" i dont know who is in the room ".这不也是陈述句吗,who is in the room.who 是主语