Relativizer

In linguistics, a relativizer (abbreviated REL) is a type of conjunction that introduces a relative clause. For example, in English, the conjunction that may be considered a relativizer in a sentence such as "I have one that you can use." Relativizers do not appear, at least overtly, in all languages; even in languages that do have overt or pronounced relativizers, they do not necessarily appear all of the time. For these reasons it has been suggested that in some cases, a "zero relativizer" may be present, meaning that a relativizer is implied in the grammar but is not actually realized in speech or writing. For example, the word that can be omitted in the above English example, producing "I have one you can use", using (on this analysis) a zero relativizer.

Since as far back as 1712, people have written about relativizers and what functions they have. They have been classified as conjunctions in earlier times, and have later been referred to as clause markers. They are known today as relativizers. Despite an agreement in nomenclature, there are multiple analyses which attempt to account for the grammatical function and distribution of relativizers.

The Promotional Analysis is a transformational analysis from 1973 depicting relative clauses in English, and how relative pronouns are introduced into the embedded clause. This analysis assumes that there is no overt head noun in the deep structure of the main clause. In order to form a relative construction, the noun phrase from the embedded clause is promoted to the empty head of the noun phrase of the main clause. From there, a corresponding relative pronoun leaves a trace in the space of the vacated noun phrase in the embedded clause. For example:

The Matching Analysis is another type of transformational analysis from the 1970s, which was in competition with the Promotional Analysis at that time. In this analysis the relative pronoun is introduced into the embedded clause by corresponding or matching to the head noun in the main clause. This is done by taking the noun phrase from the embedded sentence in the deep structure that matches the head noun in the noun phrase of the main clause, and replacing it with a relative pronoun. The relative pronoun thus co-references the head noun in the main clause. Finally, the relative pronoun is moved to the clause-initial position. For example:

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