The study of sound waves is an important part of acoustics.

Using earplugs can block out the surrounding noise.

He couldn't let go of his grudge against her.

He received a reward for his brave action.

Mr. Sonoda is my best friend.

I ate one apple.

He is the best student in the class.

I went to see a movie alone.

Mr. Ichi is my friend.

He and I went to see a movie together.