Grammatical forms refer to the structures and patterns used in a language to convey meaning. These forms include parts of speech such as nouns, verbs, adjectives, and adverbs, which help to build sentences. Each part of speech has specific rules that dictate how it can be used, such as tense for verbs or number for nouns. Additionally, grammatical forms encompass various sentence structures, including simple, compound, and complex sentences. Understanding these forms is essential for effective communication, as they help clarify relationships between ideas and ensure that messages are conveyed accurately in languages like English or Spanish.