"¿Sabes de qué están hechos?"

Traducción: Do you know what they are made of?

[horacio-C.L.]

Can anybody tell why "Do you know what are they made of?" is not ok?

[MDMalbran]

because you put "are" in the wrong place... should be "they are" not "are they"

[Zamizto]

In that case "Where are you from" and "What are you doing" would be wrong, can you tell us what's the difference please?

[MDMalbran]

In those case you're not using the auxiliar "Do" as in the previous example. That's the diference.

[gabriela_bd]

coincido!

[JoseMiguelRE]

why in this question is not right " are they made of?" in that order