We will conduct a practical test of the new product next week.

He knows that pain through his own experience.

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.

I have no way of knowing what he is thinking.

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

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

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

I am studying for the Japanese Language Proficiency Test next year.