--- title: "Syntactic, semantic, pragmatic analysis" subject: "Artificial Intelligence" chapter: 7 key: "semester_6/artificial_intelligence:nlp-syntactic-semantic-pragmatic" source: https://www.bctengineer.com/q/semester_6/artificial_intelligence/nlp-syntactic-semantic-pragmatic site: BCT Engineering --- # Syntactic, semantic, pragmatic analysis Artificial Intelligence · Chapter 7: Application of AI - Asked in: 2071 Magh, 2+2+2+2 marks - Video: [Lexical, Syntactic, Semantic, & Pragmatic Analysis in NLP Explained](https://www.youtube.com/watch?v=WaXOcZb9OhU) — SH AI Academy - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_6/artificial_intelligence/nlp-syntactic-semantic-pragmatic - Whole chapter: https://www.bctengineer.com/md/semester_6/artificial_intelligence/chapter-7 ## Question What is Natural Language Processing (NLP)? Explain the syntactic, semantic and pragmatic analysis of NLP. ## Short answer NLP enables computers to understand and generate human language. Syntactic analysis checks grammar and builds a parse tree (e.g., rejecting “Boy the rice eats”). Semantic analysis extracts literal meaning (e.g., eat(boy, rice)) and rejects nonsensical sentences. Pragmatic analysis interprets the intended meaning using context (e.g., “Do you know the time?” as a request). ## Answer **Natural language processing (NLP)** is the branch of AI that makes computers understand, interpret and generate human language such as English or Nepali, in written or spoken form. #### Syntactic analysis (parsing) It checks whether a sentence follows the grammar of the language and builds a **parse tree** showing the structure. It uses a lexicon and grammar rules such as S → NP VP, NP → Det N, VP → V NP. ```text "The boy eats rice" S / \ NP VP / \ / \ Det N V NP The boy eats rice ``` "The boy eats rice" is accepted; "Boy the rice eats" is rejected. Techniques: top-down and bottom-up parsing, transition networks, chart parsing. #### Semantic analysis It finds the meaning of the sentence from the parse tree and word meanings, mapping it to a representation such as logic or a frame, and checks that it makes sense. "The boy eats rice" becomes eat(boy, rice). "Colourless green ideas sleep furiously" is syntactically valid but semantically meaningless. It also resolves word senses ("bank"). #### Pragmatic analysis It interprets the sentence using context, speaker intention and world knowledge to get the real meaning. "Do you know the time?" means "Please tell me the time", not a question about knowledge. It also resolves references across sentences ("He took it"). Sequence: syntactic (structure) -> semantic (literal meaning) -> pragmatic (intended meaning in context). ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What does syntactic analysis produce? A. A parse tree showing the grammatical structure, using rules like S -> NP VP B. A logical meaning such as eat(boy, rice) C. The speaker's hidden intention D. A list of word senses Answer: A. Parsing checks grammar and builds a parse tree using a lexicon and grammar rules. (Key point: Purpose of syntactic analysis) 2. 'Colourless green ideas sleep furiously' is best described as A. Syntactically invalid and semantically valid B. Syntactically valid but semantically meaningless C. Valid at both levels D. Invalid at both levels Answer: B. Its structure follows grammar, but semantic analysis finds the meaning nonsensical. (Key point: Semantic analysis) 3. 'Do you know the time?' means 'Please tell me the time.' Which analysis finds this? A. Syntactic analysis B. Semantic analysis C. Pragmatic analysis D. Morphological analysis Answer: C. Pragmatic analysis uses context and speaker intention to get the real meaning beyond the literal question. (Key point: Pragmatic analysis) 4. What is the correct sequence among the three analyses? A. Pragmatic, semantic, syntactic B. Semantic, syntactic, pragmatic C. Syntactic (structure), semantic (literal meaning), pragmatic (intended meaning) D. Syntactic, pragmatic, semantic Answer: C. Structure is found first, then literal meaning, and finally the intended meaning in context. 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