The phrase "has been especially helpful" is correct and usable in written English.
You can use it to describe a person, group of people, or thing that has gone beyond standard expectations of helpfulness. For example, you could say, "The teacher's personalized tutoring for struggling students has been especially helpful."
It has been especially helpful that many of them have studied this life story in school.
Mr. Bush's trip has been especially helpful to Mr. McCain, because the senator is hardly considered a progressive.
Their effort, he said, has been especially helpful in the campaign to sway Democrats, whose party has close ties to organized labor.
Mr Kestenbaum, the franchise lawyer, has been especially helpful, he said, providing guidance and suggestions as well as making valuable introductions.
Griffin, who can play inside or outside, says McHale -- a Hall of Famer and one of the premier low-post players in N.B.A. history -- has been especially helpful with his low-post game.
She keeps copies of the kids' health forms on her person at all times, which has been especially helpful in summers, when they all go off to camp.
The tool would have been especially helpful before the housing collapse, he said, because it helps borrowers see that a lower payment might be attractive, but it may not mean that the loan is cost effective in the long run.
China's leaders have reciprocated, and have been especially helpful this year in restraining North Korea.
Among those who have been especially helpful with this survey are Kaija Poysti, Canice Prendergast, Richard Walker and Vicky Wright.
He helped develop public-private partnerships which leveraged $4.8 billion in economic development.As well as land, there are other assets, such as institutional "anchors", even in the poorest of cities. Anchors can be hospitals and universities, arts organisations, and foundations (the Mott and Ford Foundations have been especially helpful to shrinking cities).
Julie Cajune, who had been especially helpful to Hadley with her research on Native Americans, spoke from the heart about both the murals and Hadley.
