ar

In a sentence

• Es eju uz saimniecības veikalu ar tēvu.

  I am going to the hardware store with my father.

  Here, 'ar' is used to indicate companionship, meaning 'with'.

• Es griežu maizi ar nazi.

  I am cutting bread with a knife.

  Here, 'ar' is used to indicate the means or instrumentality, meaning 'with' as in 'by means of'.

• Viņš ir slavens ar savu talantu.

  He is famous for his talent.

  Here, 'ar' is used to indicate a cause or reason, meaning 'for' in this context.