As AthenaZheng explained above, 把 is used more like a preposition. But since prepositions in Chinese are originally verbs, some grammar books still call them "verbs", which might cause some confusion... About those complements... complements are a common way to modify verbs in Chinese (unlike adverbials, they always appear after the verb). There are different types of them, like "resultative complement" (结果补语), "directional complement" (趋向补语) etc. For example, the 碎 in 打碎 (smash to pieces) is a resultative complement and so is 完 in 写完 (finish writing), 说完 (finish speaking) and so on. I won't go to detail here, you just have to remember one important rule when using 把 sentences - the verb in such sentences must always be modified in some way, either by adding a comlement or otherwise (like reduplication as AthenaZheng mentioned), you can't use a single verb in it's original unmodified form. Some examples: 我把杯子打碎了。I broke the glass. (the verb is modified by resultative complement 碎) 我把论文写完了。I finished writing my thesis. (the verb is modified by resultative complement 完) 明天我要把这封信寄过去。I will send this letter tomorrow. (the verb is modified by compound directional complement 过去, other thing to notice is the placement of the modal verb 要) All adverbials, modal verbs and negatives are placed before the 把 word. Also, the object must be "already known", either mentioned in previous context or accompanied by deictic words 这个，那个 etc.

Actually 把 is a preposition，not a verb In the past some grammar books said “subject + verb + object” usually can become “subject + 把 + object + verb”, for example:我打破broke了杯子cup=我把杯子打破了, but it is not exactly,there r a lot of sentences can`t change like this, for example:我把画draw挂hang在墙上wall.≠我挂画在墙上。 But some sentences still correct when we don`t use 把. Like:把衣服都洗干净了=衣服都洗干净了。All the cloth have been washed. At this momemt u can forget 把,for衣服都洗干净了 the subject is a recipient,subject “cloth” was washed. “when the verb is followed by certain complements' What are those complements?” For example:我把嗓子throat哭cry哑dumb了.verb cry is followed by certain complement,the complement is 哑了,reprecent the result after I cried. 一、 The verb follow 把 can`t be a single one,there r a lot of examples,here r some simple . 1. vreb + 叠dié词 eg: 把衣服洗洗 （洗洗，we call it 叠词，means 洗repeated）can`t be said 把衣服洗 2. vreb +complement eg: 她把书翻fān了一下（vreb 翻thumb through + 一下complement） 3. vreb +着 or 了 eg：把门开着 keeping the door open (着 here mesns quiescent action) 把衣服脱了I peeled off cloth. 4. vreb +object eg: 把大门上了锁suǒ.(锁is object) 5. adv 一 + verb 把头一抬tái (look up) 二、 能愿动词modal verb，否定词privative，must be put in front of the verb. 别（don`t） 把书丢了。 不 把话说清楚，就不要走。（don`t leave if u haven`t made it clear.） 三、 The verb follow 把 must be a vt. 我把信（letter）寄（sent）了。寄can dominate把 的object 信。U can say 寄信。 There r still some others about how to use 把, but I think those r enough. I hope it can help u. If u still confused,we can conmunicate! O(∩_∩)O

把 [bǎ] 动词 1. （执; 握住） grasp; hold: 例句: hold a book in hand;把卷 grasp the gun tightly;紧紧把着枪 2. （看守; 把守） guard; watch; keep: 例句: guard a gate把大门 3. （掌握; 控制; 把持; 把揽 ） control; dominate; monopolize: 例句: be firm at the helm;把好舵 keep a tight control on things把着不放手 4. （帮助小孩大小便） assist child in natural functions: 例句: hold a baby while he relieves himself把屎把尿 5. （用做; 当做; 含“拿”的意思） use sth. as; regard as: 例句: use as a substitute for an umbrella ;把来做伞 take [regard] the matter seriously把这当一回事 6. （给） give: 例句: have not given it to you so far一向没把得你 7. （约束住使不裂开） chain; lock: 例句: mend the crack把住裂缝 8. （紧靠） lean against; lean on: 例句: lean against a corner formed by two walls把墙角站着

sarevok's explanation is an excellent one. complements are a major part of chinese grammar. you master these and your chinese level vastly improves. I found when asking chinese people about complements some were not to sure about what I was taking about. it's the same Ideas as if a chinese person were to ask an english speaker about grammar points. sure the english speaker uses that grammar everyday but they don't know the name of that grammar point etc. 结果补语 - complement of result ( the result of the verb's action) 趋向补语 - complement of direction ( the direction the verb is going , out, in up down) 状态补语 - complement of state 得 （it evaluates the verb)

hello! my enlish is not very well ,maybe I cann't explain this question well. in my idea, 把 is not s real verb ,it help the verb to complete a thing. for example, 我把书放在这里 in this sentence the real verb is 放 ，not 把。把 is just to show the object is book .but you need to use it.because it shows the relations between I and book. 我 is subject,书 is object。 if you have anyother questions , I will but i will try my best.^^