sadly
Regrettably.
Yes, the word regrettably is an adverb.An example sentence for you is: "Regrettably, we have had to close the store today".
That is the correct spelling of the adverb "regrettably" (sadly).
Regrettably it is not.
regrettably, no.
Regrettably, the same shape that I am in English.
Regrettably, it is not at all clear WHAT about the multiples of 56 you wish to know.
He regrettably died in 2011, he was everybody's favourite twin :)
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Regrettably, this browser does not support any kind of graphics.
Regrettably, I am closing this session. I look forward to our next session.
"He was bred for the aristocratic life of ease, regrettably circumstances forced him into menial labor."