For a long while neither his ten-year-old daughter Hilary nor the reader knew Ted's profession.

They already knew their profession, and could teach and help the others.

But they did know their profession, and they'd been right about one thing.

They seemed to know their profession however.

He knew his profession thoroughly, and was an inventor and scientist of high distinction.

Copper was a picked man, a man who knew his profession thoroughly and modernly.

The Boy is quick to catch on; it's clear he knows his profession.

Minna falls in love with Cleveland, not knowing his true profession.

According to him, even his next-door neighbors do not know his profession.

They were grown men who knew their profession.