Get can be followed by an adjective. Get gives the idea of change-the idea of becoming, beginning to be, growing to be.
In (a): I’m getting hungry = I wasn’t hungry before, but now I’m beginning to be hungry.
GET + PAST PARTICIPLE
Sometimes get is followed by a past participle. The past participle after get is like an adjective; it describes the subject of the sentence.
GET + ADJECTIVE GET + PAST PARTICIPLE
get angry–get dry–get quiet–get acquainted–get drunk–get involved
get bald–get fat–get rich–get arrested–get engaged–get killed
get big–gel full–get serious–get bored–get excited–get lost
get busy–get hot–get sick–gel confused–get finished–get married
get close–get hungry–get sleepy–get crowded–get frightened–get scared
get cold–get interested–get thirsty–get divorced–get hurl–get sunburned
get dark–get late–get well–get done–get interested–get tired
get dirty–get nervous–get wet–get dressed–get invited–get worried
get dizzy–get old