present
I occur
You occur
He occurs
She occurs
It occurs
We occur
They occur
past
I occurred
You occurred
He occurred
She occurred
It occurred
We occurred
They occurred
future
I will occur
You will occur
He will occur
She will occur
It will occur
We will occur
They will occur
conditional
I would occur
You would occur
He would occur
She would occur
It would occur
We would occur
They would occur