Bones of ancient people were discovered from this ruins.

He broke his leg bone.

Many ancient bones were found in this ancient ruins.

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

He is feigning ignorance about that problem.

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

God only knows what he is thinking.

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

I have no way of knowing what he is thinking.

He knows that pain through his own experience.