Learn Italian: La stazione è grande.

Nouns ending in -e can be either masculine or feminine. You usually have to memorize their gender as you learn them. However, there is a great trick for this specific word: Italian nouns ending in -zione are almost always feminine! That is why we use la.

How do I make a feminine -e noun like stazione plural?

You change the -e to an -i. Nouns in the -e class always take an -i in the plural, regardless of whether they are masculine or feminine. So, the plural of la stazione is le stazioni.

Why doesn't the adjective grande change to granda to match the feminine noun?

Just like nouns, some adjectives belong to the -e group instead of the usual -o/-a group. These adjectives use the exact same -e ending for both masculine and feminine singular nouns. For example, it is la stazione è grande (feminine) but also il treno è grande (masculine).

What happens to the adjective grande if the sentence becomes plural?