Learning irregular verbs is difficult.

His irregular lifestyle is having a negative impact on his health.

An irregular galaxy is a type of galaxy that does not have a definite shape.

This problem is very difficult.

You should devote at least one hour to studying every day.

I study Japanese every day.

A verb plays the role of expressing actions or states in a sentence.

I am majoring in machine learning.

My child goes to a cram school every weekend.

He is immersed in the research of deep learning.