is

>verb(used without object), present singular 1st person am, 2nd are or (Archaic) art, 3rd is, present plural are; past singular 1st person was, 2nd were or (Archaic) wast or wert, 3rd was, past plural were; present subjunctive be; past subjunctive singular 1st person were, 2nd were or (Archaic) wert, 3rd were; past subjunctive plural were; past participle been; present participle be·ing.
to exist or live:
Shakespeare’;s “To be or not to be” is the ultimate question.
to take place; happen; occur:
The wedding was last week.
to occupy a place or position:
The book is on the table.
to continue or remain as before:
Let things be.
to belong; attend; befall:
May good fortune be with you.
(used as a copula to connect the subject with its predicate adjective, or predicate nominative, in order to describe, identify, or amplify the subject):
Martha is tall. John is president. This is she.
(used as a copula to introduce or form interrogative or imperative sentences):
Is that right? Be quiet! Don’;t be facetious.
auxiliary verb, present singular 1st person am, 2nd are or (Archaic) art, 3rd is, present plural are; past singular 1st person was, 2nd were or (Archaic) wast or wert, 3rd was, past plural were; present subjunctive be; past subjunctive singular 1st person were, 2nd were or (Archaic) wert, 3rd were; past subjunctive plural were; past participle been; present participle be·ing.
(used with the present participle of another verb to form the progressive tense):
I am waiting.
(used with the present participle or infinitive of the principal verb to indicate future action):
She is visiting there next week. He is to see me today.
(used with the past participle of another verb to form the passive voice):
The date was fixed. It must be done.
(used in archaic or literary constructions with some intransitive verbs to form the perfect tense):
He is come. Agamemnon to the wars is gone.
>Origin of be
before 900; Middle English been, Old English bēon (bēo- (akin to Old Frisian, Old High German bim, German bin, Old Saxon bium, biom (I) am, Old English, Old High German, Old Saxon būan, Old Norse būa reside, Latin fuī (I) have been, Greek phy- grow, become, Old Irish boí (he) was, Sanskrit bhávati (he) becomes, is, Lithuanian búti to be, OCS byti, Persian būd was)) + -n infinitive suffix. See am, is, are1, was, were