को: Stimulus ~> Theme

When the agent of the verb is construed as an Experiencer, and the object marked by को is somehow providing that experience.

• मैं
  I

  एक
  one

  फ़िल्म
  film

  को
  DAT

  देख
  watch

  रहा
  stayed

  था
  was

  ।
  .

  'I was watching a movie.' 001