Learn Romanian: Aici este o fereastră.

In Romanian, nouns have genders. Fereastră (window) is a feminine noun, so we use the feminine indefinite article o. If the word were masculine or neuter, like un băiat (a boy), we would use un.

How can I tell that fereastră is feminine and needs the article o?

A great hint is the ending of the word. Most Romanian nouns that end in the letter -ă are feminine. Since fereastră ends in -ă, it's a very safe bet that it is feminine and will use o.

Can I change the word order to Este o fereastră aici?

Yes, both word orders are perfectly fine! Aici este o fereastră puts a little more focus on the location (Here is a window), while Este o fereastră aici feels more like a simple statement of fact (There is a window here).

How do I pronounce the word aici?

It sounds roughly like "ah-eech". In Romanian, when i is at the very end of a word like this, it is often a "whispered i". It doesn't make a full "ee" sound; instead, it just softens the c to make it sound like the "ch" in "cheese".