Does Il Est Probable Que Need the Subjunctive

The French phrase Il est probable que / Cest probable que means its probable or its likely, and it may require the subjunctive, depending on whether it is used affirmatively, negatively or interrogatively. When used affirmatively, it does not require the subjunctive. Examples Il est probable / Cest probable quil le fait.Its probable that hell do it. But when using il est probable / cest probable que to express doubt or uncertainty, it calls for the subjunctive. Il nest pas probable / Ce nest pas probable quil le fasse.Its not probable that hell do it. Est-il probable / Est-ce probable quil le fasse ?Is it probable that hell do it?