Prepositional phrases can function as adjective complements when they follow an adjective and complete/enhance its meaning.
They begin with prepositions, commonly in, about, to, etc.
They cannot exist on their own due to being depedent (non-clausal) phrases.
Tag
in+jcomp is tagged on the preposition of the complement prepositional phrase.
Examples
The solution was obvious to everyone in the room.
She was happy about the promotion.
He is interested in ancient history.
The novel is relevant to current events.
Discussions
…two is bigger than point one
Q: We understand that the comparative structure is not a typical prepositional phrase as an adjective complement (e.g., I am happy about the solution). However, this structure does still fit the pattern of adjective + preposition (than) +noun phrase. Should we include it in this tag, or should comparatives simply be considered a different structure/pattern?
A: We’d vote for comparatives being a different structure. There are many different structural options for creating comparatives in English, and they are all idiosyncratic.
Check out the list of the multi-word prepositions here.