He is troubled by his obsession.

This building needs reinforcement.

My father serves as the president of the mutual aid society.

Bats use echolocation to fly around in the dark.

This is my first time crossing the border.

It's difficult to understand his situation.

He was an accomplice in the crime.

He has anthropophobia and avoids contact with people.

He is considered an apostate by the church.

He has arachnophobia, and he panics as soon as he sees a spider.