Why?
The YUNiversity blog takes difficult English subjects, such as grammar, and explains in easy-to-understand memes like these. Students/I love these! I will certainly be using this information in my future classroom.
You bring up an excellent question.
There is a subtle (but crucial) difference between “recur” and “reoccur”:
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“Reoccur” isn’t even listed in many dictionaries. But those that do include it define it as simply “happening again,” with no mention of it being repetitive or occurring in a pattern. Quite literally, it is to “re-occur”:
