Common spelling errors

Zoo is very strong in spelling so we do not do traditional spelling exercises. We get at spelling through reading and vocabulary development (greek and latin affixes). We used some lists of commonly mispelled words to raise his awareness of mispellings.
The University of Hull
50 Common Errors
Writing Tutorial Service
Common Errors in English
Common contextual errors are trickier for Zoo.
White Smoke
Practicing homophones
We also look at variations between Canadian, British and American spellings.
http://www.clcplus.cstdi.gov.hk/images/upload/ENet/Common%20Errors%20and%20Guidelines%20for%20Spelling.htm