He was hospitalized due to mental derangement.

My older brother is currently working hard on his research as a graduate student.

He took a tranquilizer to calm his nerves.

He is learning English phonetic symbols.

What is the market price of this product?

He publicly announced that he is bisexual.

My house is located in the northwest of the town.

Next year, my younger brother will participate in the coming of age ceremony.

In the ecosystem of this area, 'inquilinism', where certain species parasitize the nests of other species, is common.

Learning about the history of Seiban is important for understanding our past.