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I am studying for the SAT, and I learned just now that the following sentence is grammatically incorrect:
Hopefully, we will be able to complete the building before the rainy season sets in.
The reason why it's incorrect is given in my study book: hopefully is an adverb, and yet it is not modifying a verb in this sentence.
I don't see how this is the case, because hopefully is modifying the verb complete. And why is that according to Google Dictionary, the following sentence is correct:
Hopefully, it should be finished by next year.