1
general::
verb ADV. commonly, frequently | infrequently, rarely | sporadically | naturally These chemical changes occur quite naturally. | spontaneously Opportunities for learning occur spontaneously every day. VERB + OCCUR be likely to, tend to | be unlikely to
Oxford Collocations Dictionary
2
general::
occur to sb
If a thought or idea occurs to you, it comes into your mind
• The thought did occur to me.
• [ + that ]: It never even occurred to us that he hadn't been invited.
• Does it never occur to you that I might like to be on my own occasionally?
Cambridge-Phrasal Verbs