He went to a clinic for semen collection.

He works collecting semen from cows.

He is good at writing, especially at writing poems.

He is a good correspondent, always writing letters.

His collection of essays shows his deep thought and insight.

I am planning to take a written exam next week.

He is learning calligraphy with a square brush.

This brush pen is easy to write with, and it's my favorite.

He used a brush rest to make detailed descriptions.

I bought a new brush, so I'm thinking of using it for the first time today.