The verb as a part of speech which denotes an action.
Semantic features of the verb. The verb possesses the grammatical meaning of verbiality - the ability to denote a process developing in time. This meaning is inherent not only in the verbs denoting processes, but also in those denoting states, forms of existence, evaluations, etc.
Morphological features of the verb. The verb possesses the following grammatical categories: tense, aspect, voice, mood, person, number, finitudeand phase. The common categories for finite and non-finite forms are voice, aspect, phase and finitude. The grammatical categories of the English verb find their expression in synthetical and analytical forms. The formative elements expressing these categories are grammatical affixes, inner inflexion and function words. Some categories have only synthetical forms (person, number), others - only analytical (voice). There are also categories expressed by both synthetical and analytical forms (mood, tense, aspect).
Syntactic features. The most universal syntactic feature of verbs is their ability to be modified by adverbs. The second important syntactic criterion is the ability of the verb to perform the syntactic function of the predicate. However, this criterion is not absolute because only finite forms can perform this function while non-finite forms can be used in any function but predicate. And finally, any verb in the form of the infinitive can be combined with a modal verb.
