Answer: be

AnswerCrossword Clue
be(used to form interrogative or imperative sentences)
be(used with other verbs to form progressive tenses, the passive voice, etc.)
behave an objective existence have reality or actuality live I think, therefore I am
beed with the past participle of transitive verbs as a passive-voice auxiliary the money was found the house is being built
beto exist
beremain unmolested, undisturbed, or uninterrupted used only in infinitive form let him be
behave a specified qualification or characterization the leaves are green
beto continue as before
betake place occur the concert was last night
beed as the auxiliary of the present participle in progressive tenses expressing continuous action he is reading I have been sleeping
beto equal in meaning have the same connotation as symbolize God is love January is the first month let x be 10
beed with the past participle of some intransitive verbs as an auxiliary forming archaic perfect tenses Christ is risen from the dead 1 Corinthians 1520(Douay Version)
beto occupy a certain place
be(used to connect the subject with its predicate adjective or nominative)
behave, maintain, or occupy a place, situation, or position the book is on the table
bebelong to the class of the fish is a trout used regularly in senses 1a through 1e as the copula of simple predication
become or go has already been and gone has never been to the circus
behave identity with the first person I met was my brother
beberyllium
beto exist or live
beed with the infinitive with to to express futurity, arrangement in advance, or obligation I am to interview him today she was to become famous
beto occur
beconstitute the same class as
belong befall