By concentrating hard he could make out the way things were inside the building.

Finally, by concentrating hard he managed to focus the boy's face more clearly.

He concentrates hard, but does not pick up every word.

She concentrated hard, trying to focus her eyes on the incredible scene.

He forgot about trying to open his eyes and concentrated hard on understanding what the people near by were saying.

He seemed to be concentrating hard, but his movements were slow.

The cold could get to you, but I just tried to concentrate and work hard.

She concentrated hard, trying to get the simple thought into a form this mob could understand.

She concentrated hard on the Hebrew text in front of her.

Concentrate hard, and at the same time try to project the feeling that you want to help.