1.break down破坏， 毁掉; 破除;制服;坍塌， 坏掉;(计划等)失败， 破裂;(健康、精神)崩溃;分解
Who broke down the doors of our classroom? 谁把我们教室的门打坏了?
The old rules must be broken down. 这些陈旧的规章制度必须废除。
2. break in破门而入， 打断
Last night a thief broke in and stole away his camera. 昨夜一个小偷闯了进来， 偷走了他的相机。
He broke in with some ideas of his own.他插了话， 说了说自己的一些看法。
3. break into破门而入， 突然……起来
They broke into the prison and set free all the prisoners. 他们冲进监狱，释放了所有的囚犯。
Hearing the sad news， the old woman broke into tears. 听到这个悲哀的`消息， 这位老年妇女突然哭了起来。
4. break out战争爆发， 争吵爆发， (火灾)发生
When did the war break out? 这场战争是什么时候爆发的?
I have heard that a quarrel broke out between them. 我听说他们之间爆发了争吵。
More than one hundred fires broke out in our city last year. 去年我市发生了一百多起火灾。
5. break away from打破陈规;奋力挣脱;放弃习惯
You must break away from these old customs. 你们必须破除这些旧风俗。
The dog broke away from its owner and ran away. 狗挣脱了主人， 跑了。
You’d better break away from the habit of smoking. 你最好改掉吸烟的习惯。