He was making an unusual effort to concentrate his attention on his duties.

In the meantime, she needed to concentrate on her duties as Speaker.

He practiced law from 1802 until 1818 when he left the field in order to concentrate on his military duties.

He said Barber would concentrate on his duties as a third-down back.

He needed to concentrate on his duties, to lose himself in them, now more than ever before.

If he does retire to concentrate on his medical duties it will be a big loss.

He retired from playing, after 88 league games and 7 goals, to concentrate on his managerial duties.

He would soon retire from broadcasting to concentrate on his Congressional duties.

Yes, she would concentrate on her duties, since that was all she had left.

Or will your wives and daughters always be preoccupied watching her, so that they can never concentrate on their duties?