Topicalization is a mechanism of syntax that establishes an expression as the sentence or clause topic: in English, by having it appear at the front of the sentence or clause (as opposed to in a canonical position further to the right). Topicalization often results in a discontinuity and is thus one of a number of established discontinuity types (the other three being wh-fronting, scrambling, and extraposition). Topicalization is also used as a constituency test; an expression that can be topicalized is deemed a constituent. The topicalization of arguments in English is rare, whereas circumstantial adjuncts are often topicalized. Most languages allow topicalization, and in some languages, topicalization occurs much more frequently than in English.

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