Learning homonyms in Japanese is difficult.

There are many homonyms in Japanese.

This problem is very difficult.

He is studying Japanese.

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

I study Japanese every day.

He is good at speaking English.

I am interested in Japanese language education.

He is immersed in the research of deep learning.

He has a learning disability, but it does not diminish his desire to learn.