I like to sing popular songs.

He likes to take a walk in the park at dusk.

Studying the history of the Imperial Examination is important for understanding the past of our country.

Sexual intercourse is one of the basic human desires.

He practices every day to improve his sailing skills.

We plan to sail on a yacht during the summer vacation.

His resounding voice echoed throughout the room.

The ringing sound of the bell filled the quiet night sky.

They were having sex in secret.

Pronouncing the palatal sounds in Japanese is difficult.