When a speech community repeatedly uses a construction, the usage grammaticizes and becomes part of the grammar.

By the end of the study, several colloquial markers had been grammaticized into fixed grammatical morphemes.

Scholars debated the grammaticalness of the sentence to determine whether it fit the language's rules.

The grammaticization of discourse markers into tense markers is a gradual process that linguists study closely.

Recent studies in historical linguistics have documented multiple grammaticizations affecting tense and aspect markers across related languages.