شد

In a sentence

• روز بسیار طولانی شد.

  The day became very long.

  Here, 'شد' is used as the past tense of 'شدن' (to become), indicating a change in the state of the subject (the day becoming long).

• در نهایت تصمیم بر این شد که امروز برگزار کنیم.

  Ultimately, it was decided that we hold it today.

  Here, 'شد' is used to imply the outcome or result of a discussion or a decision-making process.

• پنجره باز شد.

  The window was opened.

  Here, 'شد' is used as an auxiliary verb in a passive voice construction, implying the action was performed on the subject (the window being opened).