dictionaries - Is there any grammar rule for the usage of the re- prefix?


I've read carefully this question posted 4 years ago: Adding "re" prefix


You can't use the prefix re- in any verb. Rebe, rebelieve, rehave, etc.
However there are plenty of verbs that use such a prefix.


The dictionaries do not help:


Relearn does not appear in online dictionaries such as:


Macmillan (http://www.macmillandictionary.com/spellcheck/british/?q=relearn)


or Cambridge (http://dictionary.cambridge.org/spellcheck/english/?q=relearn).


Unlearn , for instance, appears in both :)


It seems a trivial issue for a native speaker but sometimes is hard for an English learner to guess whether verbs can have the re- prefix or not.




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