重要
verb [vi. 不及物动词]（尤指意外地）发生；存在，出现；（想法）产生
If headaches only occur at night, lack of fresh air and oxygen is often the cause.
如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。
| 过去式 | 过去分词 | 现在分词 |
|---|---|---|
| occurred | occurred | occurring |
- occur 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 46 Expensive and uncomfortable occur 动词: 发生
- Lesson 24 A skeleton in the cupboard
- Lesson 37 The Westhaven Express
- Lesson 60 Too early and too late
oc(向) + cur(跑) → 跑向 → 发生， 出现
单词造句:
- 网友用“Occur”造句精选
- The crash occurred when the crew shut down the wrong engine. 机组人员关错发动机后就坠毁了。
- These snails do not occur on low-lying coral islands. 这些蜗牛不会出现在低洼的珊瑚岛上。
- It did not occur to me to check my insurance policy. 我没想到要核对我的保险单。
发生
① vi. 发生
- When did the accident occur？
② vi. 被想起，被想到
sth. occur to sb. 某人(突然)想起某事
- A good idea occurred to me. = I suddenly got a good idea.
It occured to sb. that… 某人想起了……
- It occured to me that I didn't finish my homework. 我想起我还没完成作业
It occurs to sb. to do sth. 某人想起了……
- It suddenly occurred to one of the workers to open up the box. 突然一个工人想到打开箱子看看
sth. occur to sb. 某人突然想起某件事 (从后面往前面翻)
- A good idea occured to me. = I have a good idea.
To do sth occur to sb. = It occurs/occurred to sb. to do sth.
- It occurs to me to call me to call my mom. 我突然想起来给我妈妈打个电话。