Acesta este biroul meu.

This is my office.

Breakdown of Acesta este biroul meu.

• a fi: to be
• 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.

Why is the verb este used instead of sunt?

The verb a fi (to be) in the present tense:

• eu sunt (I am)
• tu ești (you are)
• el/ea este (he/she/it is)
  Here the subject is acesta (this one), which is 3rd person singular, so we use este.

Can I change the word order, for example say Biroul meu este acesta?

Yes. Romanian is relatively flexible. Examples:

• Acesta este biroul meu. (This is my office.) – Neutral, points out the object.
• Biroul meu este acesta. (My office is this one.) – Emphasizes my office.
• Acesta e biroul meu. – Colloquial contraction of este.

Are there shorter or colloquial forms of acesta?

Informally you might hear:

• ăsta (masculine) and asta (feminine)
  Example: Ăsta e biroul meu.
  In formal speech or writing, prefer acesta (masculine) and aceasta (feminine).

How do I know meu is the right form, and what if the noun were feminine?

Possessive adjectives agree with the noun’s gender and number:

• Masculine singular: meu (biroul meu)
• Feminine singular: mea (casa mea)
• Masculine plural: mei (frații mei)
• Feminine plural: mele (fetele mele)
  Identify the noun’s gender (birou is masculine) and number (singular), then use the matching form.