Is this a subjunctive statement?
Estoy cierto que él (tener) hambre. Would the conjugation be subjunctive (tenga) because of the subject change, or indicative (tiene) because of the certainty? I think it is subjuntive, but I just want to check. Thanks!
No, because you are certain, it would not be in the subjunctive mood.
The fact that you say "Estoy seguro...." opens the possibility of subjuntive. If you don't want to have to use subjunctive, simply say, "Él tiene hambre."
If you weren't certain, you could say, "No estoy cierto que él tenga hambre", and in that case, it would be a subjunctive phrase.
You're still stating an opinion of something that may or may not be true. Can your level of certainty change the mood? I'm thinking it's still subjunctive, but I would sure like to know for certain.