Aditi knows the rules of past perfect tense. But can’t use in a context. What knowledge does she possess ?

The correct answer is Declarative knowledge.

Declarative knowledge refers to explicit knowledge about facts, concepts, definitions, and rules—often described as "knowing that." In the context of language learning, it means being conscious of formal grammar rules, such as knowing the structural formula for the past perfect tense (e.g., subject + had + past participle).

Since Aditi understands and can recall the rules of the past perfect tense, she possesses declarative knowledge. However, because she cannot apply these rules fluently in real communication or context, she lacks procedural knowledge (which is "knowing how" to execute a skill or perform a task automatically).

Breakdown of Options:
- Declarative knowledge: Correct. It consists of conscious knowledge of grammatical rules and facts without necessarily having the ability to perform them.
- Procedural knowledge: Incorrect. This refers to the practical ability to use language structures automatically in communication.
- Application of knowledge: Incorrect. This is the process of using stored knowledge in practice, which Aditi is currently unable to do in context.
- Language acquisition device (LAD): Incorrect. Proposed by Noam Chomsky, LAD refers to the innate biological capability of humans to acquire language, rather than a specific form of learned knowledge about grammar rules.