How to use "gradually" in a sentence

As 'Monsieur Jean', he gradually became a different person to her, and she began not to depend on him for her happiness.

But she loved her husband even more, and she gradually became used to not depending on the old man for her happiness.

Though she always resisted the grim truth, it gradually exerted itself every time, and she was repeatedly brought down hard, forced to accept that the dream was not a premonition

Her guilt had grown gradually into a serious psychological problem

As we talked, the sky gradually became lighter