**Core Concept:** Contextual inference through syntactic relationships **Analysis:** The question tests understanding of using grammatical relationships (e.g., subject-verb agreement, prepositional phrases) to deduce word meaning. **Correct Answer (C):** The text explicitly mentions 'working out relationships between them' as part of comprehension. Observing a word's syntactic relationships (e.g., verb-object patterns) directly uses grammatical knowledge. **Error Analysis:** - A: Dictionary use is an external tool, not implicit knowledge - B: Morphology analysis focuses on word structure rather than grammatical context - D: Part of speech identification is only a preliminary step, not the full grammatical relationship analysis