Correct spelling, explanation: happened is a past tense from the verb happen. In the creation of regular past tenses, -ed suffix is added at the end of the word. Therefore, happen + ed creates happened, as there is no need for a double n and the process is generally very regular.
Definition of happened:
Verb, past tense of happen
1. To take place, to occur
The door was open; the robbery must have happened when I was out.
2. To take place by accident
I just happened to be in the right place to find a $100 laying on the ground.
Incorrect spelling, explanation: the past form of regular verbs is created by adding the suffix -ed. In case of the verb happen, this is a straightforward proccess, in which there is no need for any changes or substitutions. It is important to remember, that the past-tense suffix may differ between -ed or just d where e is already at the end of the verb, but there is no -ned variant, which would lead to forms such as
happenned, which explains, why this form does not exist.
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