In the English language all
inanimate nouns are neuter gender (it). In Russian they can be masculine, feminine or neuter. It depends on
the ending of a word. If we have a noun ending in a consonant (or ь), that means it is a masculine gender noun. Feminine nouns end in -а, -я (sometimes -ь too). Neuter nouns have endings -о or -е.
дом – a house (he)
машина – a car (she)
метро – metro (it)