Correct spelling, explanation: occurred is a past participle of a verb occur. The past participle is generally created by adding a suffix -ed to a particular verb, but there are a few other rules. To create this form from a monosyllabic verb ending with a vowel and a consonant we need to double the consonant. In this case, this consonant is r, therefore from occur we get occurred. For that reason form
occured is not correct, because the last consonant is singular.
Definition of occurred:
verb: past participle form of occur
– to happen or take place (usually unexpectedly);
An accident occurred on a highway and I got stuck in traffic for three hours.
– to appear or be present;
This condition occurred mainly among middle-aged women.
– to come to mind (usually followed by to);
An amazing idea occurred to me during the shower.
Incorrect spelling, explanation:
occured is a misspelled past participle of a verb occur. We create past participles by adding a suffix -ed to verbs. There’s is a rule, that if we have a verb that is monosyllabic and ends with a vowel and a consonant, the last consonant needs to be doubled. On that account, the past participle form occur is occurred, with doubled r. Therefore version occured is not correct.
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