What art thou doing?

Mr. Kusanagi is my best friend.

Hajime became father.

He taught me how to tie a tie.

The Mitsukuri's lantern shark is a rare fish that lives in the deep sea.

In chemistry class, I learned about alkanes.

Alkynes play a very important role in organic chemistry.

Alkenes, also known as olefin hydrocarbons, play an important role in organic chemistry.

Alkenes play a very important role in organic chemistry.

He mastered the technique of grafting grapevines.