American Heritage has this to say about this ongoing triviality: Writers who use hopefully as a sentence adverb, as in Hopefully the measures will be adopted, should be aware that the usage is unacceptable to many critics, including a large majority of the Usage Panel. It is not easy to explain why critics dislike this use of hopefully. The use is justified by analogy to similar uses of many other adverbs, as in Mercifully, the play was brief or Frankly, I have no use for your friend.
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