It takes at least five years to make an officer who knows his trade.

Whoever this sacktime artist was, he surely knew his sleeping trade.

This was translated, and the lawyer asked how I knew his trade.

My father knows his trade, and I have studied with the master.

"And in case you wish to hold anything back, remember that the torturers of Scotha know their trade."

People who worked with the two men said they were highly skilled workers who knew their trade well.

The wind is fair and Tirolan seems to know his trade.

He knew his trade well enough to find a better-paying position.

She did know her trade, as he knew his.

This guard wanted to know their names, their trade, and where they had come from before he would let them pass.