occur 是vt. 还是vi.?

vi不及物动词 用法:occur to sb

不及物动词

是不及物动词vi
可以说The incident occurred three months ago.事情发生在三个月前。
也有“occur to sb."的用法，表示“想起、意识到”，例如：
It occurred to me that she couldn't swim. 我想起她原来不会游泳。