All other forms (except the Nominative) are the same for all plural nouns, regardless of gender. The Genitive is the other exception. Here is how it is formed:
-а, -я, -о nouns: just remove the last vowel sound. Extends to -ия and -ие nouns (which become -ий). A vowel is inserted if a consonant cluster forms at the end. We will address a few common cases of fleeting vowels later in the course.
hard consonant: typical “masculine” nouns ending in hard non-sibilant consonants get the ending -ов. Those in “-й” get -ев, and so do nouns in “-ц” when the ending is unstressed (which won't help you much).
soft consonant: feminine and masculine nouns ending in -ь or hushes (Ж, Ш, Щ, Ч) will get -ей as the ending. Neuter nouns ending in -е also use this pattern.
«и́мя» and «вре́мя» become имён, времён (though, for «се́мя» and «стре́мя» it is «семя́н» and «стремя́н»)
be careful around nouns that form plurals irregularly, like друг →друзья́. Here are the genitive plurals of «друг», «мать», «дочь», «сын», «стул», «брат», «лист» and «де́рево» :