He's a bit of a troublemaker.

A little language goes a long way.

He is a mere child.

I can only do one task at a time.

I need a good amount of time to finish this project.

I have quite a lot of books in my collection.

It's a question of time before we solve this problem.

He is something of a genius.

I want to have a go at playing the piano.

In a sense, he is right.