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doubling rule

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  • kick + ed
    kicked
  • sit + ing
    sitting
  • fast + ing
    fasting
  • slip + er
    slipper
  • melt + ed
    melted
  • run + ing
    running
  • sled + ing
    sledding
  • flat + est
    flattest
  • kiss + ed
    kissed
  • tilt + ing
    tilting
  • jump + ing
    jumping
  • plan + ing
    planning
  • spin + er
    spinner
  • duck + ed
    ducked
  • ship + ment
    shipment
  • stop + ed
    stopped
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