Correct spelling


Correct spelling, explaination: we double the r in this verb, because in case of last syllable stressed in two-syllable word we double the consonant ending the word when we add -ed to it. Refer stresses the second syllable and it also ends with consonant-vowel-consonant combination, so the correct past form will be referred. Refered is incorrect as it doesn’t double the last r.

Definition of referred:
verb, past form (regular) of refer; to mention something or somebody the particular way; also, in medicine to send a patient to treatment
We referred it as “the Register” in this document.
Jack has been referred to MRI.

Incorrect spelling


Incorrect spelling, explaination: in such case, when the verb ends with consonant-vowel-consonant combination and the last syllable is stressed (reFER), we double the last letter. Thus refered is incorrect and we should spell this verb as referred. Refer + -ed = referred (doubled r).

Incorrect spelling


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