equi np deletion
Very Low / TechnicalSpecialized / Academic
Definition
Meaning
A syntactic transformation in which a noun phrase is deleted under identity with another noun phrase in the same sentence, typically in coordinate or subordinate structures.
A formal operation in generative grammar where an NP (noun phrase) that is coreferential with another NP in the same clause or in a higher clause is omitted, leaving behind a gap that is interpreted as referring to the same entity. This phenomenon is often described in terms of Equi-NP Deletion (or Equi), which specifically targets the subject of an infinitive complement clause when it's identical to a matrix clause argument.
Linguistics
Semantic Notes
The term is specific to theoretical syntax and formal linguistics. It describes a rule/constraint rather than a word or concept in common usage. It is often contrasted with 'Raising' constructions and discussed in the context of control theory.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or definition between British and American academic linguistics. The terminology is standard across the English-speaking linguistics community.
Connotations
Purely technical, with no regional connotations.
Frequency
Exclusively used in technical linguistic literature and advanced syntax courses. Frequency is negligible outside these contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
[NP₁] V [for NP₁ to VP] → [NP₁] V [to VP] (via deletion of the lower, identical NP)The syntactic rule applies to a biciansal structure where the subject of the embedded clause is deleted under identity with an argument in the matrix clause.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Never used.
Academic
Exclusively used in theoretical linguistics papers, syntax textbooks, and advanced university courses on generative grammar.
Everyday
Never used.
Technical
The primary and only context of use. Refers to a specific syntactic rule or analysis.
Examples
By Part of Speech
verb
British English
- The analysis posits that the subject of the infinitive must equi-delete.
- The verb 'persuade' typically triggers equi-deletion of the embedded subject.
American English
- In this framework, the rule is said to equi-delete the lower NP.
- The construction equi-deletes the subject of the purpose clause.
adverb
British English
- The NP is obligatorily deleted in an equi-deletion fashion.
- The rule applies equi-deletively in these contexts.
American English
- The subject is interpreted equi-deletively.
- The process functions equi-deletively under coreference.
adjective
British English
- The equi-deletion analysis has been challenged in recent minimalist work.
- We need to account for this equi-deletion phenomenon.
American English
- This is a classic equi-deletion environment.
- The equi-deletion rule applies in control structures.
Examples
By CEFR Level
- In the sentence 'John wants to leave', some grammarians say the subject of 'to leave' is deleted because it's the same as 'John'. This is a simple example of a process like equi NP deletion.
- Linguistics students often find rules like equi NP deletion difficult when they first encounter them.
- The standard analysis of 'Peter tried to win' involves equi NP deletion, where the subject of the infinitive 'win' is deleted under identity with the matrix subject 'Peter'.
- Equi NP deletion was a central rule in the Classical Theory of transformational grammar, handling predicate complement structures.
Learning
Memory Aids
Mnemonic
Think EQUIvalent Noun Phrase: the lower NP is EQUIvalent to the higher one, so it gets DELETEd.
Conceptual Metaphor
GRAMMAR IS A CALCULATION / SYNTAX IS A FORMAL SYSTEM. The process is framed as a mechanical rule applied to a logical structure.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid a direct word-for-word translation like 'удаление равного нп' which is meaningless. The concept is discussed in Russian linguistics as 'удаление экви-именной группы' or more commonly 'конструкция управления (контроля)'.
Common Mistakes
- Confusing it with 'Raising' (e.g., 'seem' constructions).
- Using it to describe simple ellipsis in conversation.
- Assuming it's a term from computational linguistics (like 'data deletion') rather than theoretical syntax.
Practice
Quiz
In which theoretical framework was 'Equi NP Deletion' a standard transformational rule?
FAQ
Frequently Asked Questions
The specific rule by that name is largely associated with earlier models of transformational grammar (e.g., the Aspects model). In modern minimalist syntax, the phenomenon is typically handled by the theory of 'Control' and the licensing of a null pronoun (PRO), not by a deletion rule per se.
Equi NP Deletion applies when the lower subject is semantically an argument of the lower verb and is coreferential with a matrix argument (e.g., 'John wants to leave'). Raising applies when the lower subject becomes the subject or object of the matrix verb, and its thematic role comes only from the lower verb (e.g., 'John seems to be late').
Yes. In the deep structure of 'Mary hopes to succeed', the infinitive clause would be 'for Mary to succeed'. The rule of Equi NP Deletion deletes the lower 'Mary' because it is identical to the matrix subject, resulting in the surface sentence 'Mary hopes to succeed'.
Almost never. It is a meta-linguistic term for describing language structure, not a pedagogical tool for learners. Teachers might use simpler terms like 'leaving out the repeated subject' when explaining sentences like 'He decided to go'.