Main verb

From Teflpedia

A main verb (/meɪn vɜ:b/) is either the central verb in a main clause, or the head of a verb phrase. This is a syntactic role.

Both lexical verbs and the primary verbs (do, be and have) can function as main verbs. When be is used as a main verb it is a copular be.

Note that lexical verbs exclude the primary verbs.