This issue pertains to our research.

I live in Tōbetsu.

Of course, he has the ability to solve that problem.

Of course, he has the ability to solve that problem.

Of course, he can solve that problem.

He was criticized for his unjust actions.

This word is an old term and is not often used in modern times.

This used laptop is no longer usable.

Do you need something?

The declension of verbs in Japanese is very complex.