My name is Tanaka.

That is my personal issue.

We are going on a trip together.

I lost my precious belongings.

Could you please tell me your name?

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

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.