This application is very convenient.

You can apply this theory to actual problems.

What is this tool used for?

In this old document, the archaic word '用ゐる' is used.

My personal thought is that everyone should be treated equally.

He values his private life.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.