Acesta este biroul meu.

to be

Breakdown of Acesta este biroul meu.

• biroul: the office
• meu: my
• acesta: this

Questions & Answers about Acesta este biroul meu.

What is the difference between acesta and acest, and why is acesta used here?

acesta is a demonstrative pronoun meaning “this one” and stands by itself as the subject of the sentence.
acest is a demonstrative adjective that must modify a noun (e.g., acest birou = “this office”).
Since we want to say “This is my office,” we need the pronoun acesta.

Why is the noun birou written as biroul?

Romanian expresses definiteness by attaching an enclitic article to the noun.

• birou (office) + -ul (masculine singular definite article) → biroul (the office)
  This replaces the separate English article the.

Why does meu come after biroul, and why isn’t it al meu?

Romanian word order for possession is:

1. Noun with its enclitic article (birou → biroul)
2. Possessive adjective that agrees in gender and number, placed after the noun (masculine singular → meu)
   So biroul meu = my office.
   The phrase al meu exists (e.g., Acesta e al meu = This is mine) but is used when the possessor stands alone or for extra emphasis.