• Producing a representation of the meaning of the input language. This representation may be quite different from the input.

  John sold his rabbit to Bill.
  Did Bill buy a pet?

• Filling in missing information.

  I was late for work today.
  My car wouldn't start.
  The battery was dead.

  The battery is part of my car. The battery's being dead caused my car not to start. The car's not starting caused me to be late for work because I usually use the car to drive to work and because if a car will not start, it cannot be driven.

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