occur的过去式过去分词

disaster副词occur的名词occur的过去式过去分词disastrouslyoccurence过去式occurred过去分词occurred搜一下：disaster副词occur的名词occur的过去式，过去分词2，occur啥意思Occur:发生occur[英][??k?:(r)][美][??k?]vi.发生;出现;闪现;第三人称单数：occurs现在进行时：occurring过去式：occurred过去分词：occurred3，occur是什么意思发生，=happen=takeplace...