He is feigning ignorance about that problem.

He knows that pain through his own experience.

I have no way of knowing what he is thinking.

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

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

God only knows what he is thinking.

I went to see a movie by myself.

Watching a movie alone is enjoyable.

We respect Japanese culture.

We are going on a trip tomorrow.