AbstractThis paper examines cyclical changes involving complementisers, for instance,whetherin the history of English.Whetherstarts out as a pronoun and after frequent topicalisation is reanalysed as an element in the left‐most layer of the sentence. The same is true with prepositional phrases that are fronted and then reanalysed as part of the CP layer. The paper uses a Minimalist approach in that it seeks answers for the linguistic changes in terms of Economy Principles such as Specifier‐to‐Head Reanalysis. It examines two sources of renewal of complementisers, full phrases such as demonstrative pronouns and heads such as the verbs that reanalyse as question particles in Chinese.