"¿Viste a mi hermano cocinando sopa de tortuga?"

Translation: Did you see my brother cooking turtle soup?

[TilEulenspiegel]

It is interesting that DL calls this section "Gerunds," when there apparently is no construction in Spanish that is specifically the equivalent of English gerunds. http://www.spanishdict.com/topics/show/31

[TheSupernatural]

Yeah I was thinking the same thing

[Talca]

Another important take away from this sentence actually is the reinforcement of "the personal "a." As a newbie, I am 100% sure I would have said-- ¿Viste mi hermano cocinando sopa? INCORRECTO.

[SlickSims20]

a normal sentence in Chinese..

[azngirl]

I put cocinado when it's supposed to say cocinando..come on, it's a typo!

[Ddesgagne]

Yes, it may be a typo, but from my past experience Duolingo doesn't accept typos when they are actually other words. You may have been trying to type 'cocinando' which means 'cooking' but 'cocinado' is also a Spanish word, and it means 'cooked'.

[Romana...]

I thought that it should stay: "a turtle soup".
Any native English speaker to help...?

[Swanee11]

No, Americans would not use that. I can't speak for Australians or Brits.

[RichWay3]

Now i see the use for the earlier sentence "ahora debemos eliminar los testigos".