1. 碰巧：forget忘记 | happen碰巧 | hate憎恨,厌恶
2. (偶然)发生：handy 便利的,顺手的 | happen (偶然)发生 | ▲happiness 幸福,愉快
3. 强调偶然性：come about发生; (风等)改变方向; 转帆, 转航向 | happen强调偶然性 | take place强调必然性或按计划而发生
1. （偶然）发生，出现
Something that happens occurs or is done without being planned.
e.g. We cannot say for sure what will happen...
我们无法确定会发生什么事。
e.g. The accident happened close to Martha's Vineyard.
事故发生在玛莎葡萄园附近。
2. （作为结果）发生，产生
If something happens, it occurs as a result of a situation or course of action.
e.g. 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。
e.g. 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。
3. （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.
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e.g. 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。
e.g. It's the best thing that ever happened to me.
这是我所遇到的最好的事情了。
4. 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.
e.g. 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。
e.g. 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》。
5. 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.
e.g. 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。
词典解释
1. （偶然）发生，出现
Something that happens occurs or is done without being planned.
e.g. We cannot say for sure what will happen...
我们无法确定会发生什么事。
e.g. The accident happened close to Martha's Vineyard.
事故发生在玛莎葡萄园附近。
2. （作为结果）发生，产生
If something happens, it occurs as a result of a situation or course of action.
e.g. 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。
e.g. 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。
3. （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.
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e.g. 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。
e.g. It's the best thing that ever happened to me.
这是我所遇到的最好的事情了。
4. 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.
e.g. 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。
e.g. 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》。
5. 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.
e.g. 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。
happen 情景对话
道歉
A：I do beg your pardon for the mistake I’ve made.
请您一定原谅我所犯的错误。
B：It’s OK. That can happen to the rest of us.
没关系，谁都会发生这种事情。