Mr. Sugimoto is my best friend.

His explanation was impossible to understand.

His actions are nothing more than a misunderstanding.

Time passes by too quickly.

The silk gauze dress is very beautiful.

Mr. Wakasugi is my best friend.

Mr. Sugimura is my best friend.

Discrete mathematics is an important field that forms the basis of computer science.

He is majoring in applied mathematics at university.

He is passionate about researching pure mathematics.