The word Skifed is misspelled against Skiffed, which is past tense of "Skiff"
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Skiffed has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Ski & ed which should not be misspelled with single 'F'
Wrong Spelling:  Ski-f-ed 
Correct Spelling:  Ski-ff-ed 
Find more wrongly spelled words of Skiffed to spell it well.