His success is based on the assumption that he is a hard worker.

Humans and nature should coexist.

I think these teaching materials will be very useful for the students.

I decided to build a house with timber.

He traveled east and west.

His new idea is very innovative.

He acted according to my instructions one by one.

His nickname is 'Samurai'.

He observed a year of mourning after his father's death.

Tokuma is my best friend.