During morpho-syntactic annotation each lexical tokens in the text corpus becomes a tag of morpho-syntactic labels such as part of speech and other morphological characteristics.

Identification of part of speech is the basic step not only for morpho-syntactic analysis, but also for many other linguistic annotations such as syntactic, semantic etc. Thereby, the tokens are tagged (e.g as nouns, verbs, adjectives, adverbs) and the syntactic function of the word is identified. It determines, which thematic role (e.g subject, object, predicate) has a word in the sentence.

This will be followed by analysis of morphological characteristics and inflectional morphology. During this analysis each token is reduced to its basic morphological form and its morphological structure (internal structure of words) and grammatical forms (such as number, gender, case, person, tense, aspect, mood etc.) are allocated.