a

In a sentence

• A venit la timp.

  He/She arrived on time.

  Here, 'a' is an auxiliary verb used for forming past tenses.

• Am cumpărat a doua carte.

  I bought the second book.

  Here, 'a' is used as part of the ordinal indicator.

• Mă duc să aștept autobuzul.

  I am going to wait for the bus.

  Here, 'a' acts as a preposition denoting purpose/intention.