Correct spelling, explanation: the form occur is correct, because there is no need to add another r at the end – for pronunciation-connected nor any other reason. This r is doubled if we add a suffix, for example -ed (occurred), due to the rule saying that we need to double the last consonant if the word ends with combination of consonant-vowel-consonant. However the word itself, occur, is spelled with just one r. Therefore
occurr is an incorrect form.
Definition of occur:
verb, to happen, to appear
This behaviour is mobbing and it mustn’t occur in any workplace.
If such conditions occur, leave the building immediately.
Incorrect spelling, explanation: this form is wrong, because there is no reason to double the last consonant. It would be unpronounceable anyway. R is doubled in this case when we add to the word any suffixes, for example -ing: occurring. This happens because the word occur ends with consonant-vowel-consonant combination. However the word itself is occur, not
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