I had trouble concentrating, and it certainly hurt my game.

I am really going to have trouble concentrating until Ben calls back.

Besides, I had enough trouble concentrating on my own life force.

I had trouble concentrating for the rest of the day.

Not sure he was ready, in spite of the fact that he'd been having trouble concentrating for the last several days, really.

At school, the child who used to have trouble concentrating began making better grades.

His voice was a low monotone and she had trouble concentrating.

It was Luke who had trouble concentrating on his meal.

They have trouble concentrating, reasoning and doing simple math problems.

I am having a great deal of trouble concentrating on the scene at hand.