Please explain me why "for you to decide" is treated as predicative (in the following sentence: This is for you to decide.) while for you to say is treated as subject in the following sentence. It is easy for you to say that. Thank you.
I think "it" is the subject in the second sentence, not "for you to say that". I may be wrong though.
But "to say that" is the subject in:
To say that is easy for you.
(Even if it's not a natural sentence.)