- When an earthquake happened last week, this is an example of when an earth quake occurred.
- When corn grew naturally in a given part of the country, this is an example of when corn occurred naturally.
- When you suddenly remember you forgot to take the trash out, this is an example of when it occurred to you that you forgot to take out the trash.
Occurred is defined as something that happened, took place, existed or was found, or it is a thought or idea coming into someone's mind.
- simple past tense and past participle of occur