He is in a state of fatigue.

I'm worried about his health condition.

The serrated blade of this knife is suitable for cutting hard objects.

This company is aiming for diversification of products.

The police are investigating the source of the threatening letter.

The police issued an arrest warrant against him.

He received the letter challenging him to a duel and began preparing for the duel.

He received an indictment.

I received a wedding invitation letter from a friend yesterday.

I received a letter of recommendation from my teacher for admission to university.