occur的第三人称单数：
occurs
occur的用法：
occur的用法1：occur的基本意思是“呈现在视野、思想、意识中”。occur常与介词to连用,意为“发生”“想起”等。
occur的用法2：occur一般只用作不及物动词,含有“出乎意料”的意味,不可用于表达意料之中或计划之中的事情,也不与suddenly连用。
occur的用法3：occur有时还可用作系动词,接形容词作表语,多表示“存在”。
occur的用法4：occur没有被动语态,即使含有被动意义,也须用主动语态来表达。
occur第三人称单数例句：
1. conception occurs when a single sperm fuses with an egg.
当一个精子和一个卵子结合时受孕就发生了。
2. if a crime occurs then there is, ipso facto, a guilty party.
如果犯罪发生了，那么根据事实本身，就会有有罪的一方。
3. it occurs in elderly men, apparently as part of the ageing process.
这种情况出现在老年人当中，显然是衰老过程的一部分。
4. you know, it occurs to me you could solve all your problems by obtaining more money.
依我看，你的所有问题都可以通过多挣点钱来解决。
5. a burglary occurs every three minutes in london.
伦敦每3分钟就会发生一起入室抢劫案。
6. change occurs at a glacial pace.
变化极其缓慢。
7. it occurs to me that example is always more efficacious than precept.
我想到身教重于言教.
8. when trouble occurs at one spot, help comes from all quarters.
一方有难, 八方支援.
9. salt occurs naturally in sea water.
盐天然存于海水中.
10. many students"error occurs because of mother - tongue interference.
许多学生发生这种错误是由于母语的干扰.
11. calamity occurs in successive years.
灾祸连年.
12. her birthday occurs on july 4.
她的生日是7月4日.
13. when hay fever first occurs it is often mistaken for a summer cold.
花粉病初期常被误认为是风热感冒。
14. the cry occurs when air is brought into contact with the baby"s larynx.
婴儿的喉咙接触到空气时，就会哭出来。
15. the cattle disease occurs more or less anywhere in africa where the fly occurs.
在非洲凡是有这种蝇虫的地方，几乎都会出现这一牛病。
