Question

Do you have any idea of _____?


about what he's talking


what is he talking about


what is he talking


what he's talking about

Answer 1

Do you have any idea of what he's talking about?

Перевод:

Вы хоть понимаете, о чем он говорит?

(После союза what идёт прямой порядок слов (подлежащее+сказуемое...))