Are these all correct?

[ngoc_lan]

My teacher asked me to rewrite a sentence: They/not find/cause/fire
I wrote: They still haven't found the cause of the fire.
But my teacher said it was incorrect and she gave me the answer:
They still haven't found out what caused the fire.
Which is correct? If my sentence is wrong, please correct it for me.
Thank you very much!
ngoc_lan

 

[bhaisahab]

My teacher asked me to rewrite a sentence: They/not find/cause/fire
I wrote: They still haven't found the cause of the fire.
But my teacher said it was incorrect and she gave me the answer:
They still haven't found out what caused the fire.
Which is correct? If my sentence is wrong, please correct it for me.
Thank you very much!
ngoc_lan

Your sentence is fine, so is your teacher's sentence.

 

[ngoc_lan]

Is "found" different from "found out" in the context of this sentence?

 

[bhaisahab]

Is "found" different from "found out" in the context of this sentence?

No, there is no difference in meaning.

 

[ngoc_lan]

Thanks a lot!