This article explores the variation surrounding the semi-modals be going to and gonna. While gonna is frequently mentioned alongside be going to, it remains under-described in traditional grammars and academic literature. However, recent studies within Construction Grammar suggest that gonna may represent an independent construction, prompting a reconsideration of other variants within the be going to / gonna paradigm such as gon and imma, which appear to derive directly from gonna and no longer from be going to. In light of recent work, what have traditionally been regarded as mere ‘phonetic realizations’ or ‘orthographic variants’ may in fact play a more significant role in the formation and definition of constructions, raising questions about the structure of constructional networks. This article analyzes the immediate syntactic environment of the variants to account for both the variation of forms and the status of such forms. The study is conducted using two corpora that are particularly prone to showing linguistic innovations and language change: a spontaneous spoken corpus and a web corpus. Findings indicate that shorter variants often involve elision of be and that gonna is more grammaticalized than going to, based on the types of verbs they precede.