occur

过去式：occurred

过去分词：occurred

现在进行时：occurring

词形变化：

动词过去式: occurred | 动词过去分词: occurred | 动词现在分词: occurring | 动词第三人称单数: occurs |

词义辨析：

同义:

vi.发生

happen

transpire

come about

take place

同义参见:

become

be

exist