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Wh-movement




According to Joseph Greenberg 's Linguistic Universal No.12, VSO languages always have wh-movement, while SOV languages never do. Many SVO languages have wh-movement too, such as English , but some don't, such as Mandarin . Languages without wh-movement are referred to as wh-in-situ languages.


WH-MOVEMENT IN ENGLISH

English is one language that features wh-movement. For example, a Declarative Sentence in English featuring normal Word Order would be:
: He buys bread.
The Direct Object , "bread", of the Verb , "to buy", normally follows the verb, however, when the direct object is replaced with a wh-word in order to form a question, the wh-word generally appears at the beginning of the sentence:
: What does he buy?

In English main clauses, a form of "to do" must be used as in the absence of an Auxiliary Verb . The auxiliary verb (including a form of "to do") occurs after the wh-word and before the subject:
: He should buy bread.
: What should he buy?

In Transformational approaches to syntax, wh-movement is analyzed literally in terms of constituent movement, where a moved constituent leaves behind a silent Trace (often indicated by a ''t''):
: What does he buy ''t''?


PIED-PIPING


Pied-piping (first identified by John R. Ross ) describes the situation where a phrase larger than a single wh-word occurs in the fronted position. In the case where the wh-word is a Determiner such as ''which'' or ''whose'', pied-piping refers to the fact that the wh-determiner appears sentence-initially along with its complement. For instance, in the following example, the entire phrase "which car" is moved:
: Which car does he like ''t''?

In the transformational analysis, the wh-word ''which'' moves to the beginning of the sentence, luring its complement ''car'' with it, much like The Pied Piper Of Hamelin attracted rats/children that would follow him, hence the term ''pied-piping''.

In the case of determiners, pied-piping is obligatory. For instance, the following sentence would be ungrammatical:
  • Which does he like ''t'' car?


However, there are cases where pied-piping can be optional. In English, this is often the case when a wh-word or phrase is the object of a Preposition . For instance, the following two examples are both grammatical:
: To whom did she reveal her secret ''t''?
: Whom did she reveal her secret to ''t''?

The second example is a case of preposition stranding, which is possible in English, but not allowed in Latin or other Romance Languages . For languages that use Postposition s rather than prepositions, stranding is not allowed either.

Prescriptive grammarians often claim that preposition stranding should be avoided in English as well, however in certain contexts, obligatory pied-piping of prepositions in English may make a sentence feel artificial or stilted (e.g. "This is the sort of bloody nonsense up with which I will not put.").


EXTRACTION ISLANDS

In many cases, a wh-word can occur at the front of a sentence, regardless of how far away its canonical location is. For example:

: Who does Mary like ''t''?
: Who does Bob know that Mary likes ''t''?
: Who does Carl believe that Bob knows that Mary likes ''t''?

However there are cases in which this is not possible. Phrases from which a wh-word cannot be extracted are referred to as extraction islands.


Adjunct islands

An adjunct island is a type of island formed from an Adjunct clause. Wh-movement is not possible out of an adjunct clause. Adjunct clauses include clauses introduced by ''because'', ''if'', and ''when'', as well as Relative Clause s. Some examples include:

: Grammatical: You went home because you needed to do what?
  • What did you go home because you needed to do ''t''?


: Grammatical: Alex likes the woman who wears what?
  • What does Alex like the woman who wears ''t''?



Wh-islands

A wh-island is an island that is created by an embedded sentence which is introduced by a wh-word. For instance, the clause "where Eric went to buy the gift" in the following example, is a wh-island:

: John wonders where Eric went to buy the gift.

Wh-islands are weaker than adjunct islands since extraction is often awkward but not necessarily considered ungrammatical by all speakers.

: Grammatical: John wonders where Eric went to buy what?
: Questionable: ?What does John wonder where Eric went to buy ''t''?


Subject extraction

It is typically easier to extract objects rather than subjects from a clause, especially when an overt Complementizer such as "that" or "for" is used. Take the following examples:

: Grammatical: Who do you believe ''t'' saw Tom?
  • Who do you believe that ''t'' saw Tom?

  • : Grammatical: Who do you believe Jim saw ''t''?

: Grammatical: Who do you believe that Jim saw ''t''?


Subject clauses

Wh-movement does not appear to be possible in clauses that appear in the subject position. For instance, here is a sentence where the clause appears in the object position:

: It is likely that John went home.

Here is the same sentence where the clause appears in the subject position:

: That John went home is likely.

Notice that wh-movement can occur only in the clause that appears in the object position:

: Grammatical: Where is it likely that John went ''t''?
  • Where is that John went ''t'' likely?



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