The three verbs together form a chain, or verb catena (in purple), which functions as the predicate of the sentence. The finite verb has is inflected for person and number, tense, and mood —here, respectively: third person singular, present tense, indicative. The nonfinite verbs been and examined are, except for tense, neutral across these categories and are not inflected otherwise. The subject, proposal, is a dependent of the finite verb has, which is the root (highest word) in this verb catena. The nonfinite verbs lack a subject dependent.