I believe you to be a liar.

[keannu]

Does 2 make sense? Maybe "You are believed to be a liar" definitely makes sense, but I doubt 2.

1. I believe that you are a liar.
2. I believe you to be a liar.

 

[Route21]

As an NES but not a teacher, I have no problem with 2, per se.
I, personally, would not normally use it, however.
I would classify it as similar to "I believe you to be a cad, sir" i. e. old fashioned terminology.

Regards
R21

 

[konungursvia]

Both are fine, doubting Thomas.