be

auxiliary verb [+ -ing verb] (CONTINUE)

strong /biː/ weak /bi/ /bɪ/ (being, was, were, been)

Definition

A2 used with the present participle of other verbs to describe actions that are or were still continuing: I'm still eating. She's studying to be a lawyer. The audience clearly wasn't enjoying the show. You're always complaining. I'll be coming back (= I plan to come back) on Tuesday.

(Definition of be auxiliary verb (CONTINUE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)