"Am going to buy" is the verb phrase, and "definitely" is describing it. It is really hard to determine which of the words in the verb phrase is being specifically described, but by the word order, I would go with "going," but it is a typical word order with the adverb placed into the middle of the phrase. It could happen that a person would say, "I am going to definitely buy a new car," to distinguish between, say, buying and renting a car.
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Englishmaven"Am going to buy" is the verb phrase, and "definitely" is describing it.This is my opinions.
EnglishmavenIt is really hard to determine which of