Verb Forms

Sometimes there is a spelling change when the -s, -ing, and -ed endings are added.
In the following verbs ending in e, you just add -ing in the normal way to form the -ing form. For example, the -ing form of age is ageing.
  • age
  • agree
  • disagree
  • dye
  • eye
  • free
  • hoe
  • knee
  • referee
  • singe
  • tiptoe
You don't double the final consonant of verbs ending in w, x, or y when forming the -ing form or past form.
  • row -- rowing -- rowed
  • box -- boxing -- boxed
  • play -- playing -- played
In British English, you double the final l of verbs like travel and quarrel, even though the last syllable is not stressed.
  • travel -- travelling -- travelled
  • quarrel -- quarrelling -- quarrelled
You don't double the final l in American English. In British English, and sometimes in American English, the final consonant of the following verbs is doubled, even though the last syllable is not stressed.
  • handicap
  • hiccup
  • kidnap
  • program
  • worship
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