He was hiding the fact that he was an onanist.

What do you want to eat?

I don't know how many people are coming.

Do you have something to drink?

What is this, that box?

Please choose anything you want.

If you don't mind, you can use my car.

Above all, grammar is the most important in learning Japanese.

We need personnel who can handle any problem.

When he was surprised, he shouted loudly.