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

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

The vaquita is an endangered species and one of the rarest dolphins in the world.

When will you go to Japan?

When are you going to Japan?

He will help at any time.

How old are you?

How old are you?

He tried to solve the problem again and again.