They'd concentrated all their efforts on trying to find her.

Jane concentrated on trying to get some air into her lungs.

Now they can concentrate on trying to start a winning streak.

I told him where to find it, then concentrated on trying to focus my eyes.

He concentrated now on trying to spell out the situation for the President.

He pushed the thought away, concentrated on trying to ease some of that fear.

He concentrated on trying to remember the young man's name, or at least where he'd seen him before.

We are already concentrating on trying to solve these two issues.

He said the state should concentrate on trying to improve academic performance in the urban schools.

He began concentrating on trying to land where there weren't any people.