"Eu não sei o que você vai perguntar."

Translation: I do not know what you are going to ask.

[RadeRadovanovic]

"I do not know what are you going to ask" was rejected.

[LoreLove9]

Same for me, and I was in a really good streak

[ZuMako8_Momo]

In English, if the sentence is a question, the verb should come after "what" or any other question word. This sentence is not a question; the "what" introduces the a relative clause, so the verb should come after the subject "you."

[srshti]

How would you translate "I do not know that you are going to ask" (that instead of what)?

[Paulenrique]

"Eu não sei que você vai perguntar". If you hint word for word you'll find o=the, que=that. But, if you find "o que", the translation is what

[Mallowigi]

In French it would be "ce que" right?

[Paulenrique]

Yup!! = "je ne sais pas ce que tu vas demander?" (Right?)