Do you know what it is?还是Do you know what is it?

Question

是宾语从句吗

Answer 1

应该是：Do you know what it is?
其中what it is是宾语从句，宾语从句的语序应该是陈述语序，即主语在前，谓语在后。

Answer 2

前者是对的。 因为 what it is 在句中做宾语从句， 要用陈述语序。 所以
Do you know what it is? 对。

Answer 3

Do you know what it is?
是宾语从句