Correct spelling, explanation: happened is the correct form, because contrary to such words as planned or beginning, the n in happened is not a part of the stressed syllable. Usually, we double the last consonant when we add a suffix to a word ending with the combination of consonant-vowel-consonant. Here, however, the accent is not on the syllable including n, therefore
happenned is incorrect, because in such case we usually do not elongate this sound.
Definition of happened:
verb, past simple and past participle of happen, to occur
Don’t worry about your mistake. Things like this happened to me as well when I was learning the profession.
This trip is the best thing that has ever happened to me.
Incorrect spelling, explanation: this form is incorrect because, in case of happened, the accent is on the first syllable, not the one with n in it. Otherwise, it would be spelled with double n, as planned. Despite the consonant-vowel-consonant rule, which says that we double the last consonant when adding a suffix, here stressed syllable is crucial because if there is no stress, we don’t elongate the sound, hence single n. Therefore
happenned is incorrect, and the correct spelling is happened.
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