Surely I'm doing more useful work here, really, even for the war.

During this time, the system was not performing useful work.

Poor old fellow, he is past doing any really useful work.

They left, Bill looking all happy that he was going off to do useful work with his hands.

Also: There would be nobody left to do any useful work.

He can use the prisoners of war for useful work - rather than simply making them to sit and eat.

That's the only way I can continue doing any useful work at my age.

Taking up hands that could be put to useful work.

Then we can look forward to some extremely useful work on a subject of growing public concern.

"I was going to get some useful work done this morning."