How to say in Czech: They have found out something.

English
have found out something.
Czech
Oni něco zjistili.
I found it something of a disappointment.
Have they lost something?
They have lost something.
Did they do something wrong?
Did they say something wrong?
Do they smell something burning?
That’s something they will never understand.
They knew there was something wrong.
They need something stronger.
They smell something burning.

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