Clasing or Classing: How To spell?

The word Clasing is misspelled against Classing, which is present continuous of "Class"

Classing has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings cla & ing which should not be misspelled with single 'S'
Wrong Spelling: cla-s-ing
Correct Spelling: cla-ss-ing
Find more wrongly spelled words of Classing to spell it well.