wh-fronting

Wh-movement (or wh-fronting or wh-extraction or long-distance dependency) is a mechanism of syntax that helps express a question (or form a relative clause). Sentences or clauses containing a wh-word (interrogative word) show a special word order that has the wh-word (or phrase containing the wh-word) appearing at the front of the sentence or clause, e.g. Who do you think about?, instead of in a more canonical position further to the right, e.g. I think about you. The term wh-movement is used because most English interrogative words start with wh-, for example, who(m), whose, what, which, etc. Wh-movement often results in a discontinuity, and in this regard, it is one of (at least) four widely acknowledged discontinuity types, the other three being topicalization, scrambling, and extraposition. Wh-movement is found in many languages around the world, and of these various discontinuity types, wh-movement has been studied the most.