Internal structure is the makeup of a phrase, regardless of what stands outside that phrase. The puppy keeps putting my slippers behind the couch , click here . Features A. Types of features. Verbs forms can be finite or nonfinite. Finite forms can be lexical or auxiliary.
Auxiliary forms can be aspectual or modal.
By definition, aspectual auxiliaries take participle verb forms. By definition, modal auxiliaries take bare verb stems. The distinction is a contextual one. We disagree with Baker in that we do not have a V infinitive . While Baker often uses Vpresent or Vpast in tree diagrams, we will use V finite .