դա

In a sentence

• Դա իմ գիրքն է։

  That is my book.

  The word "դա" is used as a demonstrative pronoun here, indicating a specific object—'that'.

• Դա հեշտ է հասկանալ։

  That is easy to understand.

  In this sentence, "դա" introduces a concept or situation, functioning as a pronoun 'that' referring to an implied idea.

• Ես տեսա դա երեկ։

  I saw that yesterday.

  Here, "դա" serves as the object of the verb, referring to something previously mentioned or known.