Knowledge is often considered synonymous with terms like familiarity, understanding, wisdom, education, awareness, etc. Knowledge can be expressed in the form of data, scientific formulae, product specifications, manuals, universal principles, and so forth. Knowledge may be declarative or procedural. Procedural knowledge in learning grammar refers to understanding how a grammatical form functions in use and applying the same.It is the knowledge of how to perform a specific skill or task and is considered knowledge related to methods, procedures, or operation of equipment.It goes hand in hand with appropriate competencies in a particular area. It is largely based on the performance of the right action in the correct sequence. Procedural knowledge in language helps learners to learn grammar, and their structures and apply it while communicating. It is also known as imperative knowledge which implies that action must be performed to obtain the desired result.Hence, it could be concluded that 'understanding how a (grammatical) form is and applying the same' is known as procedural knowledge.Additional Information Declarative knowledge enables a student to describe a rule of grammar and apply it in structured and limited practice. It means establishing knowledge of grammar rules or patterns in the learners minds.