Jamais is this adverb
This 
construction works in a very similar way to the ne...pas construction: ne comes... [DOC] [TLE] Learn French Adverbs  The Simple Guide - Talk in French [PAR] Feb 15, 2014 ... French adverbs have its own rules and functionalities, but this article will ... 
something happens, toujours, souvent, parfois, rarement, jamais.