In researching the classification of verbs that are accompanied by other words that may be adverbs or prepositions it seems like some sources favor prepositional verbs as a sub-category and others separating these two separate categories; where phrasal verbs are accompanied by adverbs and prepositional verbs are only accompanied by prepositions.
Further, it seems that neither of these includes verb constructs that are used to form infinitives, as in "it is going to be sunny on Saturday?" Is that correct?