In the sentence:
Daenerys should probably keep that green dragon-egg.
What is the syntactic category of "probably" here? Is it an adverb? If so, what substitution test should I use to verify that it is an adverb?
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It's an adverb, since it is used between the parts of the compound verbal predicate; since there is the adjective 'probable', and an adjective + the '-ly' suffix produces an adverb; and since it modifies the whole sentence and that is one of the functions of adverbs.
The synonyms are:
in all likelihood, in all probability, as likely as not, very likely, most likely, likely, as like as not, ten to one, doubtless, no doubt, all things considered, taking all things into consideration, all things being equal, possibly, perhaps, maybe, it may be, presumably, on the face of it, apparently.