Wh-Questions and WH-Movement in Syntax | X-Bar Theory

In generative syntax, all languages share the same movement operations (head movement, DP movement, and wh-movement) required by the Principle of Full Interpretation, but cross-linguistic variation arises from whether these movements occur before or after the Spellout operation that bifurcates derivation into Phonetic Form (PF) and Logical Form (LF). Movement occurring before Spellout is overt (audible in surface structure), while movement occurring after Spellout is covert (silent but reflected in meaning). This distinction explains phenomena like quantifier scope ambiguity, wh-in-situ languages, and island effects across different languages.

Long-distance wh-questions involve successive cyclic movement (stepwise), with intermediate positions lacking interpretations. In Chinese and similar languages with wh-in-situ, wh-phrases don't visually move but undergo mental 'cover movement'—evidenced by having the same properties as English/German questions. This demonstrates that the minimalist principles apply universally, even when surface forms differ. The distinction between natural and human sciences is stark: natural sciences refine generalizations when exceptions arise (Neptune's orbit led to Pluto discovery), while human sciences often abandon generalizations at first exception. This methodological difference explains why some scientific fields advance while others remain stuck in descriptive modes.

Logical form is a representational level in linguistic theory where covert movement happens after overt syntactic operations. While phonological form involves visible movements (like question formation), logical form involves hidden movements that don't appear in spoken language but are essential for meaning. LF allows linguists to create multiple structural representations from a single surface sentence, enabling different interpretations to be captured even when surface syntax appears uniform.

While English primarily uses wh-in-situ only in echo questions, other languages like Chinese employ wh-in-situ as a standard question formation strategy. In Chinese, wh-words appear in their base positions in wh-questions, and attempting to move them results in ungrammatical sentences. This represents a fundamentally different type of wh-in-situ compared to English, where wh-movement is the norm. This cross-linguistic variation will be further explored in Chapter 13 when discussing covert movement.

Logical Form (LF) and Phonetic Form (PF) are interface levels that communicate with external modules outside the syntactic component. LF interfaces with semantic and conceptual systems, providing information about meaning and interpretation. PF interfaces with phonological and articulatory systems, providing information about sound patterns. These interface levels are responsible for assigning phonetic and semantic properties to sentences. Operations attributed to LF include movement that occurs after surface structure but before final interpretation.

WH movement, also known as A'-movement, is a syntactic operation where question words (wh-words) move from their base position to a higher position in the sentence structure. This movement creates questions from declarative sentences. The instructor prefers the lowering analysis for WH movement, which involves moving the wh-element up the tree rather than having the verb lower to accommodate it. This contrasts with the selectional analysis discussed in some textbooks.

A-movement, or argument position movement, is a syntactic process in English where a constituent (typically a noun phrase) moves from its base position to a higher argument position to satisfy two grammatical requirements: the Extended Projection Principle (EPP) which requires an overt subject in the specifier position of IP, and case assignment, which must occur in a position with case potential; this movement occurs because the VP domain lacks the ability to assign nominative case, so the IP triggers the lower DP to move to a higher A-position where both requirements can be satisfied simultaneously.

The interesting properties of movement types are determined by two causal factors: whether the movement feeds case assignment, and where it lands. English A-movement doesn't feed case and lands in TP. English bar movement doesn't feed case and lands in Spec CP. Hindi local scrambling doesn't feed case but lands in TP. The speaker raises the question of whether a language could exist that flips Hindi's pattern (landing in Spec CP but feeding case), which remains an open question in syntactic theory.

Evidence from Icelandic case theory supports a derivational model of syntax. In quirky case constructions with raising to object, nominative objects receive case even without visible agreement, puzzling traditional theories. This disappears if we assume the embedded clause was originally finite, then underwent Kinyalolo dissimilation reducing both C and T. Anaphor agreement effects (blocking reflexives in embedded clauses) similarly require a derivational account. Control constructions involve a minimal pronoun undergoing short-distance movement, creating the same Kinyalolo configuration and explaining their reduction patterns. Both A-movement (subject raising) and A-bar movement (wh-movement) trigger Kinyalolo dissimilation effects, supporting their formal unity despite traditional distinctions. This challenges approaches denying the fundamental sameness of wh-movement and raising.

Phase theory, introduced by Chomsky in his 1998-2000 minimalist inquiries, proposes that syntactic derivations can be divided into discrete chunks called phases (such as CP and little VP), where each phase becomes convergent once all its uninterpretable features are checked; once a phase is complete, it is immediately sent to the phonological and semantic components for spell-out and interpretation, and the derivation can forget about it, thereby saving derivational memory and enabling efficient processing of complex structures like multiple wh-movement.

Minimalist theory fundamentally differs from GB theory by assuming movement is not free but must be motivated. The feature checking mechanism forces elements to move only when necessary. Key examples include: (1) VP-internal subjects must move to SpecTP to check T's agreement features; (2) verbs must raise to T to check each other's redundant features. Both movements are necessary because failure to move leaves uninterpretable features at LF, causing derivation crash. This demonstrates how feature checking implements the minimalist constraint that movement occurs only when forced by the system.

Phase theory, introduced by Chomsky in his 1998-2000 paper 'Minimalist Inquiries,' addresses how long derivations should wait before deciding convergence. The core principle is that derivations can converge and be spelled out in chunks rather than waiting for the entire derivation to complete. A phase is defined as a stage in derivation where we take stock and decide what part is complete—specifically, a chunk of structure with no uninterpretable features left. Once a phase is completed, it can be sent forward for spell-out and interpretation, and the derivation can forget about it, saving derivational memory.

The Minimalist Program emphasizes economy principles in derivation and representation. The Economy of Derivation principle states that the shortest derivation is preferred over longer ones, and overlapping derivations should eliminate unnecessary operations. The Economy of Representation principle states that elements should move to check features in them rather than in the element they move to. Movement is only justified when there is a strong feature requiring checking in the surface structure, not in the underlying structure. This reflects the view that movement is a measure of imperfection in language, to be avoided unless absolutely necessary.

This comprehensive section establishes the theoretical framework for understanding interfaces in the Minimalist Program. It traces the evolution from the Principles and Parameters model to the Minimalist Program, where interfaces became central to grammatical architecture. Key concepts include the Full Interpretation Principle, the Strong Minimalist Thesis (language as optimal solution to interface constraints), and the distinction between internal interfaces (within grammar components like syntax, morphology, phonology) and external interfaces (confronting cognitive frameworks). The section covers the morphological distribution hypothesis, the cartographic project for discourse-pragmatic interfaces, and the Borer and Chomsky feature evaluation system. It distinguishes between evaluated and non-evaluated features, and interpretive and non-interpretive features, explaining how verbal compounds must have fully specified matching features to be referential expressions.