Then, the adverb is promoted to a new verb "สนุ กสนาน-vi/enjoy" while the old verb is demoted to a modifier for the new verb constituting the Promotion/Demotion Technique.
in this case, the Lexical Replacement pattern forces the process to specifically choose the trees not just only whose TLCSs are identical to the TLCS input but also whose syntactic structures are the same as that of the TLCS input tree.