短语动词 break out 最常见的意思是“ 突然开始；爆发”，通常指战争、打斗等不愉快事件，例如：
My mother seemed fine this morning, but she did break out crying at the funeral.
我妈妈今天早上看起来很好，但她在葬礼上突然哭了起来。
解析：seem 是一个用法非常广的系动词，相当于 appear，不用进行时。
We knew it was time to leave the club when a fight broke out between guys at the bar.
我们知道是时候离开俱乐部了，酒吧里发生了一场争吵。
Fighting broke out in the street when the two gangs came together.
当两个帮派碰面的时候，街上爆发了战斗。
解析：动名词 fighting 可以作主语，因为它有名词的语法功能。
break out (of sth) 表示逃离（某地）；摆脱（某状况），例如：
They broke out of prison and fled the country.
他们越狱逃往国外。
The criminal broke out of prison, but was captured less than a mile away.
罪犯越狱了，但在不到一英里外就被抓获了。
She needed to break out of her daily routine and do something exciting.
她需要从日常事务中解脱出来，找点有意思的事做。
break out in sth 表示突然被布满某物，例如：
Her face broke out in a rash.
她脸上突然长出一片红疹。
She broke out in a rash after eating some strawberries.
她吃了一些草莓后起了疹子。
解析：after 引导的时间状语从句，因为状语从句的主语和主句的主语一致，可省略状语从句的主语和 be 动词。
When I heard the noise, I broke out in a cold sweat.
当我听到那声音时，我吓出一身冷汗。
break sth out (of sth) 表示用力从某物上分开，例如：
Carefully, she broke the gemstone out of the side of the rock face.
她小心地把宝石从岩壁的侧面打碎了。
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