Everyone was surprised by the news.

He is feigning ignorance about that problem.

It's better for him not to know the truth. After all, ignorance is bliss.

He knows that pain through his own experience.

He is working hard to make his abilities known to the world.

God only knows what he is thinking.

I have no way of knowing what he is thinking.

In order to understand his feelings, I had a deep conversation with him.

He likes to take a walk in the park at dusk.

She described the pain of a broken heart as tears.