They discussed the subject of the offender of the meaning of life.

The content of his speech is not relevant to the subject.

His thesis doesn't make sense. To begin with, its theme is obscure.

It was very difficult to understand the subject of his lecture.

A perfect knowledge of a few writers and a few subjects is more valuable than a superficial one of a great many.

You must not lose sight of your main object.

I am familiar with this subject.

The librarian classified the books according to subject.

The principal theme of the book is the American Revolution.

Please classify these books by subject.

Is this an anime theme song?

I like the theme song.

What's your favorite TV show theme song?