Tibetan grammar describes the morphology, syntax and other grammatical features of Standard Tibetan, a Sino-Tibetan language. Standard Tibetan is typologically an ergative–absolutive language. Nouns are generally unmarked for grammatical number, but are marked for case. Adjectives are never marked and appear after the noun. Demonstratives also come after the noun but these are marked for number. Verbs are possibly the most complicated part of Tibetan grammar in terms of morphology. The dialect described here is the colloquial language of Central Tibet, especially Lhasa and the surrounding area, but the spelling used reflects classical Tibetan, not the colloquial pronunciation.