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