1.break down破壞， 毀掉; 破除;制服;坍塌， 壞掉;(計劃等)失敗， 破裂;(健康、精神)崩潰;分解
Who broke down the doors of our classroom? 誰把我們教室的門打壞了?
The old rules must be broken down. 這些陳舊的規章制度必須廢除。
2. break in破門而入， 打斷
Last night a thief broke in and stole away his camera. 昨夜一個小偷闖了進來， 偷走了他的相機。
He broke in with some ideas of his own.他插了話， 說了說自己的一些看法。
3. break into破門而入， 突然……起來
They broke into the prison and set free all the prisoners. 他們沖進監獄，釋放了所有的囚犯。
Hearing the sad news， the old woman broke into tears. 聽到這個悲哀的消息， 這位老年婦女突然哭了起來。
4. break out戰爭爆發， 爭吵爆發， (火災)發生
When did the war break out? 這場戰爭是什么時候爆發的?
I have heard that a quarrel broke out between them. 我聽說他們之間爆發了爭吵。
More than one hundred fires broke out in our city last year. 去年我市發生了一百多起火災。
5. break away from打破陳規;奮力掙脫;放棄習慣
You must break away from these old customs. 你們必須破除這些舊風俗。
The dog broke away from its owner and ran away. 狗掙脫了主人， 跑了。
You’d better break away from the habit of smoking. 你最好改掉吸煙的習慣。