I learned about anhydrides in chemistry class.

I like to study new languages.

In chemistry class, I learned about the reactions of acid anhydrides.

I will teach mathematics to new students tomorrow.

I attended a math class today.

He is majoring in chemistry at university.

He learned to empty his mind through meditation.

He is an expert in chemistry.

There is a class observation at my son's school tomorrow.

The use of mobile phones is prohibited during class.