A 把B ...... means A does something actively, B suffers the result of A's action or A's action have somme influence on B e.g. 我把盘子打破了 means : I break the dishes into pieces. the subject "I" do the action, the dishes suffer the result of my action. A 被B...... means A suffers the result of B's action, B does the action e.g. 我被狗咬了 means : I was bite by the dog. It's the dog do the action and i suffered from his action. Hoping that this kind of explenation can help you.

把, to do something , or make /have something done... 我 把 书 弄丢了。 i lost my book. 我 把 他 送到学校。i take him to the school. 我 把 饭 吃完了。i finished off the food. 被，to be done/made by somebody. 书 被 我 弄丢了。that book was lost (by me). 他 被 我 送到学校。 he was sent to school (by me). 饭 被 我 吃完了。the food was finished off by me.

把---的主语是动作的实施者 被---的主语是动作的接受着

oh , it is really difficult . Cause you have to understand in chinese way . for example : I was striked by a car (我被一辆车撞了） A car striked me （ 一辆车把我撞了）

"把"is a verb in Chinese,and all the verbs in Chinese Dictionary have "手" in the left side of the word of the Chinese.I gave you some examples in oral Mandaren."把" has many meanings in English,it means just like verbs below: get,pick,wear,take,set,hang,etc. you can use this word in the sentence "......,please." ex1."Open the door,please."请把门打开. ex2."Close the window,please."请把窗户关上. in any case,when you can use "please" in English, you can use "把" in Chinese. its meaning you request sb. do sth. ================================================================================ if you can understand the article below, you can say you know Chinese: 过 秦 论