In the following sentence, what does hopefully mean, what part of speech is it, and what does it modify?
Hopefully the rain will end soon.
From http://www.merriam-webster.com/dictionary/hopefully:
1 : in a hopeful manner
2 : it is hoped : I hope : we hope : hopefully the rain will end soon
It must be #2 according to the example. If it means "it is hoped" or "I hope" then is the entire main subject and predicate of the sentence subsumed into the word hopefully?
A related question is, if I use a comma, how does that change the sentence grammatically and semantically?
Hopefully, the rain will end soon.
Best Answer
Hopefully is an adverb in your excerpt, but it modifies the entire sentence rather than any individual word within it. It is an example of a disjunct, about which Brinton & Brinton (via LinguisticsGirl) say
More specifically, it is a sentence adverb, a common if sometimes disliked usage:
Oxford reports general suspicion of sentence adverbs in some quarters; some prefer to reword them— it is lucky that in place of luckily— and reject those which refer to the speaker's attitude, which cannot be reworded in this way (one cannot say it is frank that in place of frankly). That seems quite arbitrary, however. Clearly, such usage is widely accepted, and hopefully, you will not get caught up by misguided purists.