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VERB
（偶然）发生，出现
Something that happens occurs or is done without being planned.
例句
We cannot say for sure what will happen...
我们无法确定会发生什么事。
The accident happened close to Martha's Vineyard.
事故发生在玛莎葡萄园附近。
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VERB
（作为结果）发生，产生
If something happens, it occurs as a result of a situation or course of action.
例句
She wondered what would happen if her parents found her...
她不知道如果父母找到自己会有什么结果。
He trotted to the truck and switched on the ignition. Nothing happened.
他匆匆走向卡车并转动点火开关，结果没有任何反应。
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VERB
（尤指不愉快的事）发生（在…身上）;(某人)遭到;遇到
When something, especially something unpleasant, happens to you, it takes place and affects you.
例句
If we had been spotted at that point, I don't know what would have happened to us...
如果当时我们被发现了，我不知道会有什么后果。
It's the best thing that ever happened to me.
这是我所遇到的最好的事情了。
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VERB
碰巧;凑巧
If you happen to do something, you do it by chance. If it happens that something is the case, it occurs by chance.
例句
We happened to discover we had a friend in common...
我们凑巧发现我们有一个共同的朋友。
I looked in the nearest paper, which happened to be the Daily Mail...
我仔细看了一下离自己最近的那份报纸，正巧是份《每日邮报》。
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PHRASE
碰巧，恰恰（尤引出令人意外的事）
You use as it happens in order to introduce a statement, especially one that is rather surprising.
例句
She called Amy to see if she had any idea of her son's whereabouts. As it happened, Amy had.
她打电话给埃米，看她是否知道自己儿子的行踪。埃米还真就知道。