A question came up recently that made me wonder how this form is for the verb です.
I know that です has a ～たら form that is conjugated as だったら。But, does it have a ～れば form? Is it でれば？ (I don't think so because that's more likely 出れば。) Is it だれば？ Or is it であれば？ (from である rather than です）
If it is であれば, why is that so?
I know that once I knew this but I seem to have forgotten. Help!