I've done what I could for them in a few weeks.

You've never had to drive the best bargain you could for your fish.

Hell, they could for a political party and do damage that way instead.

At this point he'd done everything he could for them.

She was in a room by herself, and it looked like they'd done everything they could for her.

I'd do anything in the world I could for him.

The women had known that it would be so and did what they could for her.

The doctor did not answer, but turned to do what he could for the hurt man.

The state would do what it could for their families.

Well, he could for the duration of the task at hand.