The verb - the notional part of speech that denotes an action or process and states.
Semantic features of the verb. The verb possesses the grammatical meaning of verbiality - the ability to denote a process developing in time.
Morphological features of the verb. The verb possesses the following grammatical categories: tense, aspect, voice, mood, person, number, finitude and phase.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. And finally, any verb in the form of the infinitive can be combined with a modal verb.