4.Verbs with two syllables, add the last consonat, then add -ed.

Example : prefer - preferred
  control - controlled


5.The verbs which ending with y. Change -y into- i then add -ed.

Example : study - studied
  cry - cried
  carry - carried


But, if the letter before y is the vowel. It could add - ed by without adding the last consonant . [No changes]

Example : play - played
  stay - stayed



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