It is correct and usable.
You can use it to emphasize the focus that someone has on something, or to contrast that focus with something else. For example: She was so concentrated on the task at hand that she didn't notice the change in the atmosphere.
Just imagine, he added: "You have people who are so concentrated on one performance, and then 5,000 people are dispatched into eternity, in a single moment.
His passion was for anatomy; he told the story of how he had been so concentrated on an anatomy dissection one day in 1843 that he failed to look outside to observe the street procession known as the "Disruption" which launched the Free Church of Scotland.
But he's so concentrated on himself that he forgets he has an uke (the one who receives the attack): me.
Back then I was more like, 'Oh God!' and so concentrated on what I was doing".
"People were so concentrated on the image on the screen that they didn't even look two centimeters above".
The only trouble was that they sometimes seemed so concentrated on making the relentlessly repetitive rhythms constant that they forgot to make them live.
So concentrate on doing whatever it takes to regain Labour's reputation for economic competence.
Poor countries have more of the latter, so concentrate on low-skilled work.
Viacom, on the other hand, has missed some opportunities, perhaps partly because it has spent the last year or so concentrating on splitting from its sister company, CBS Corporation.
Le Feu de Braise, 14, rue Albert Briand, (508) 41 91 60, has little in the way of décor, so concentrate on the succulent food.
We do not include research ratings or research funding — these are tables aimed at students taking first degrees and so concentrate on teaching and teaching resources.
