Kosuke is my best friend.

Without knowledge of auxiliary verbs, it is difficult to understand Japanese grammar.

He is working as an assistant teacher at the university.

I heard that Pansuke opened a new bakery yesterday.

He is working as an assistant director in a film.

Sousuke is my best friend.

Ryunosuke is my best friend.

He, being a sleepyhead, was late for school again today.

There are various types of planted trees and shrubs in my garden.

In this experiment, we will dissolve salt in an aqueous solution.