1. Grammatical structure describes the systematic formal devices used in a language to convey meanings and relationships, rather than absolute rules of correctness or mere usage.
2. Elements of grammatical structure include word order, inflection, correlation of forms, function words, intonation, stress, and pauses. These signals convey meaning.
3. Comparing grammatical structures between two languages involves analyzing whether structures have the same formal device, meaning, and distribution, or differ, which causes more difficulty for learners. Transfer from the native language affects production and recognition differently.