The phrase 'has been doing since' is correct and usable in written English.
It is used to convey that someone has been doing something up to the present time. For example, "He has been doing Yoga since he was a teenager."
Asked what she has been doing since, Ms. Jimenez, a 19-year-old native of Venezuela who has been in this country since 2001, laughed uneasily and said she had not been doing anything.
It was not clear what Mr. Raposo has been doing since his acquittal in July 1996.
And that is what Greene has been doing since he moved away from the Welsh valleys.
"Argentina wants to carry on paying its debts, as it has been doing since 2005," the advert reads.
Well, all he has been doing since is proving that he's less Curry's sidekick and more like his equal.
As an added bonus, we find out what Eleanor Roosevelt has been doing since she died in 1962.
The concept captures exactly what China's leadership has been doing since 2013, particularly with President Xi Jinping's vision of Chinese dream and his One Belt, One Road Initiative.
In a follow-up column next week, we will tell you how American Giant has been doing since the redesign and what Mr. Winthrop thinks of your suggestions.
It is what our "Invest in Freedom" campaign has been doing since 1996, and many unions in Britain have since joined up.
This account doesn't go much beyond what has been in the Times — indeed, follow-ups have overtaken it — but Risen offers a useful perspective on what the C.I.A. has been doing since September 11th, and some devastating summary judgments.
Most Americans regard what their government has been doing since September 11th as a necessary war of self-defence: a war that was declared by America's enemies and will be over only when those enemies are beaten.
