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be

 
 
strong /biː/ weak /bi/, // auxiliary verb

Definition

used with the present participle of other verbs to describe actions that are or were still continuing: Where are you going? How long have you been sitting there? He was standing by the window. He's working at the moment.
used with the present participle of other verbs, and sometimes after a modal verb, to describe actions that will happen in the future: I'm going to France next week. I'll be coming back on Tuesday.
used with the past participle of other verbs to form the passive: He was injured in a car crash. The results will be announced next week.
used in conditional sentences to say what might happen: If he were to offer me the job, I'd take it.
used to say that someone must or should do something: You are not to see him again.
formal used to show that something has been organized: They are to stay with us when they arrive.
(Definition of be auxiliary verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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