He explained using high language.

He declared his opinion.

Collagen is important for maintaining the firmness and elasticity of the skin.

He got decompression sickness after diving.

He is a teacher-cum-writer.

While being a student, he is also working at a restaurant as a side job.

Ken is my best friend.

I never thought you would go, you know.

I live in Kaneyama.

Kaneda is my best friend.