Give them the emotion and inner life. Give yourself over to the whole moment. To be real you must soak yourself. Has to look like life . Art is not truth , a lie to see the truth.
Humanity is always dreadful.
In life we don't know what comes next, the same in acting. In life we struggle to overcome emotions , the job of the actor is to be swimming in them. It's all work in progress. Life is work in progress. Life is accidental, not rehearsed.