Answer: is

AnswerCrossword Clue
isto exist or live
isto continue as before
isto occupy a certain place
isthird person singular present indicative of be
isto occur
isthe ninth letter of the English alphabet
is(used to form interrogative or imperative sentences)
is(used with other verbs to form progressive tenses, the passive voice, etc.)
is(used to connect the subject with its predicate adjective or nominative)