The occurance of earthquakes is common in this region.

There were several occurances of the word misspelled in the document.

This situation is occurable.

The two events are co-occurring.

Re-occurring dreams can be a sign of unresolved issues.

The non-occurring event left everyone surprised.

The non-occurring of rain caused a drought in the region.

The same issue seems to re-occur every month.

These two events often co-occur.

The two events co-occurs frequently.