The word Cusing is misspelled against Causing, which is present continuous of "Cause"
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Word contains consecutive vowels 'AU' in between alphabets c & sing is misspelled as 'U' as letter 'A' is phonetically ignored
Wrong Spelling:  c-u-sing 
Correct Spelling:  c-au-sing 
Check more misspelled words of Causing to spell it correct.