In Latvian grammar, Nouns are a fundamental part of the language. They are words that indicate a person, place, thing, or idea. Nouns in Latvian have three genders: masculine, feminine, and neuter. The gender of a noun determines the form of the adjective that comes after it. Additionally, nouns can have singular and plural forms, which are formed by adding suffixes to the stem of the noun.

Nouns in Latvian also have declensions, which means that their endings change depending on their grammatical role in a sentence. There are seven different declension patterns in Latvian, each with its own set of endings. These patterns are determined by the gender, number, and case of the noun. The case of a noun indicates its relationship to other words in the sentence, such as whether it is the subject, object, or possessive.

Understanding the theory of nouns in Latvian grammar is essential for correctly constructing sentences and expressing ideas in the language. It allows learners to manipulate nouns and their endings to create grammatically correct and meaningful sentences.