'happend' is a spelling mistake of happened. Happened is past tense ie- the storm had happened a week before the playoffs. Trip down memory lane this idiom in english refers to an occasion when people remember or talk about things that happened in the past.
It can be used while talking about things that happened in the past but continuous. If the issue happened during the lesson, you can leave the preply classroom early to see a prompt for reporting an issue:
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