passive...

[nautes20]

Dear Teacher...

I put a wrong question a few minutes ago.

The right question is : "This problem is answered by nobody'"

The above sentence is wrong?
If so, I'd like to know the reason...

Best regards...

 

[Mister Micawber]

I didn't see the original or the context, but this one looks fine to me, Nautes. I might have written 'has been answered', but your grammar is correct out of context.

 

[nautes20]

Do you think so?

You mean "The problem was solved by nobody."is correct?

 

[Mister Micawber]

Yes. What do you suppose is wrong with it?