It is important to understand the importance of health.

Do you understand the necessity of this project?

It's difficult to understand his explanation.

In order to understand the importance of the three Rs, it is necessary to learn the basics of reading, writing, and arithmetic.

Please fill out all the necessary information on the application form.

He is good at arithmetic.

He does arithmetic every day.

I read for an hour every day.

I read for more than an hour every day.

I like to study new languages.