The nominative case (именительный падеж) is almost a freebie in Russian. The way a word appears in the dictionary is how it appears in the Russian nominative case. ‘Nominative’ comes from nominare (to name), and in именительный you may recognize имя, meaning ‘name’.
The Russian nominative case is the unmodified or default form of a word. If nothing is being done to it in the sentence, you don’t need to do anything either.
This is my car, the book is thick: машина and книга stay as they are.
The same applies to names. Moscow is big, Putin is in charge: Москва and Путин remain unchanged.
In the sentence, these words are the subject. They answer the question what (что) or who (кто).
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For the nominative plural, the same simplicity applies. You just need to know how the plural is formed, no further modifications are required.
Masculine
Feminine
Neuter
Exceptions in the nominative case
There are also some irregular plurals and surprises. Some masculine words take а or я instead of ы or и. Examples include глаза (eyes), города (cities), and учителя (teachers). An ья ending appears in words like стулья (chairs), братья (brothers), and мужья (husbands). In друзья (friends), the г in друг changes to a з, and сын (son) becomes сыновья in the plural.
Some neuter words also form their plurals with ья, such as дерево (tree) becoming деревья, and крыло (wing) becoming крылья. In колени (knees) and яблоки (apples), the о changes to и. Уши (ears) sees the х in ухо turn into a ш. The words имя (name) and время (time), despite ending like feminine words, become имена and времена in plural.
For feminine words, both мать (mother) and дочь (daughter) take peculiar plural forms: матери and дочери.
Finally, some plurals follow no regular pattern. Человек (person) becomes люди (people), and год (year) turns into лет (years). This leaves plenty of room for learning. More irregular plurals can be found in Russian Language Nouns – Irregular Plural Forms (Cafe Russian, 2016, 3 mins) and Part 2 (2016, 4 mins).
Russian plurals – Russian lesson for beginners
(E-Russian, 2019, 12 m)
Beginning Russian: Plural Forms of Nouns
(Amazing Russian, 2023, 9 mins)
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