LEXICAL VERB, They do not fulfill any of the criteria for auxiliaryhood, They can never form catenative constructions (-ing / - to inf), that is to say, they cannot take verbal complementation, Morphologically, they are divided into: regular / irregular, AUXILIARY VERB, The verb has no independent existence., It acts as an operator in the NICE (negation, inversion, code, emphatic affirmative) context., It may take pre-adverb and pre-quantifier position, It does not impose semantic restrictions on the subject, It accepts existential there as subject, It is normally neutral to passivisation, A VP may contain a maximum of up to four different forms, MODAL VERB, They are followed by a bare infinitive, They do not have tensed forms, They do not have the third person –s inflection, They cannot co-occur (2 or more verbs in a row), They have an abnormal time reference, CATENATIVE VERB, share features with lexical verbs: 1) they need do-support; 2) they always function as head within the VP (they are not dependent like auxiliaries), can be followed by the to-infinitive OR -ing, with or without a change in meaning, can form structures with other VPs (take verbal complementation)

CLASSIFICATION OF VERBS: FUNCTION

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