Oo

Occur:

To take place; come about.

Ocurrir, Suceder:

Producirse de forma espontánea.

Tomado de: (Google definiciones, 2.016).

Occur - Ocurrir, Suceder.
Tomado de: (Google imagenes, 2.016).

Simple form	Third Person	Simple Past	Participle	Gerund
Occur	Occurs	Occurred	Occurred	Occurring