Incorrect spelling, explanation:
happenned is incorrect, and happened is correct, because the first syllable is stressed and the last isn’t, so we don’t double the consonant n. We double the last consonant when adding a suffix to a consonant-vowel-consonant combination only when this last syllable is the stressed one. So here happened is the correct spelling.
Correct spelling, explanation: this is the correct spelling because the accent in happened is on the first syllable, not the one with n, therefore n is not doubled. If an accent in a word ending with a consonant-vowel-consonant combination is on this syllable then the last consonant in a word is doubled (like in planned). In happened the consonant p is doubled because it’s a part of the stressed syllable, not n, so
happenned is incorrect.
Definition of happened:
verb, past simple and past participle of happen, to take place
I have a very weird headache, it has never happened to me before.
What happened? Why do you have these bruises?
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