Depen or Deepen: How To spell?
The word Depen is misspelled against Deepen, a verb meaning "To become deeper; as, the water deepens at every cast of the lead; the plot deepens."
Deepen has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings D & pen which should not be misspelled with single 'E'
Wrong Spelling:  D-e-pen  Correct Spelling:  D-ee-pen 
Explore spell check of Deepen to spell without errors.