
In linguistics (especially generative grammar), a complementizer (or complementiser) is a lexical category (part of speech) including those words that can be used to turn a clause into the subject or object of a sentence. For example, the word that is generally called a complementizer in English sentences like Mary believes `that` it is raining......
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http://en.wikipedia.org/wiki/Complementizer

an element or elements marking a complement clause, as that in We thought that you forgot, for … to in For you to go all the way there would be silly, or possessive …-ing in Barbara's leaving so early worried them.
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https://www.infoplease.com/dictionary/complementizer
No exact match found.