Submitted by György Chityil ... on Sat, 03/03/2018 - 11:33 Lemma: happenNgram Count: 1Starts with letter: YesIndefinite Article: aGoogle Ngram Count: 27110987Sense count: 1Contained in other ngrams: 4Hierarchy: Past ParticipleForms: happeninghappensForms Count: 2