Sanskrit morphology is generally studied in two broad fundamental categories: the nominal forms and the verbal forms. These differ in the types of endings and what these endings mark in the grammatical context. Pronouns and nouns share the same grammatical categories, though they may differ in inflection. Verb-based adjectives and participles are not formally distinct from nouns. Adverbs are typically frozen case forms of adjectives, states Jamison, and "nonfinite verbal forms such as infinitives and gerunds also clearly show frozen nominal case endings".