La Nieve

Yo tenía mucha nieve en mi casa.

In spanish, the words have a gender (due the sound of the word), in this case, 'nieve' has a feminine gender termination, so the adverb (or adjective) must have the feminine gender termination too (* with exceptions), pretty easy.

a = feminine, e/o = masculine.

La = feminine, El/Los = masculine.

La nieve blanca (The withe snow), El gato gracioso (The funny cat).

(There is no gender in english)