Answer: am

AnswerCrossword Clue
amto exist or live
am(used to form interrogative or imperative sentences)
am(used with other verbs to form progressive tenses, the passive voice, etc.)
amamericium
amto occur
am1st person singular present indicative of be
amamplitude modulation: a method of impressing a signal on a radio carrier wave by varying its amplitude
amto continue as before
amof, pertaining to, or utilizing such a system
amsystem of broadcasting by means of amplitude modulation
amto occupy a certain place
am(used to connect the subject with its predicate adjective or nominative)