Articolul (the article)

a, an, the

Articolul nehotărât

în general articolul nehotărât se folosește în convorbire în situații generale, non-specifice, ne-definite
înaintea substantivelor la singular (o casă, un om)
la denumirea naționalității, prețului, vitezei, măsurii timpului profesiunii
câteva numnerale (a couple, a dozen, a milion, a bilion, a lot of ..., a great number of..., a great deal of ...)
exclamații

I bought a computer last year. (there are many computers - I'be bought one)

Regarding this, may I ask a question? (there are many questions - can I ask one?)

Is there a restaurant near here? (there are many restaurants - is there one near here?)

Satu Mare is an interesting Romanian city. (there are many interesting Romanian cities - Satu Mare is one)

I am a Romanian. (there are many Romanians - I am one of them)

Cornelia is a teacher. (there are many teachers and Cornelia is one)

What a beautifull dress!

Can you repeat the question. (the question that you asked)

București is the capital of Romania. (there is only one capital of Romania)

We enjoyed our holiday. The place was very beautifull. (our place)

I'm going to clean the carpet tomorrow. (my carpet)