重点:①过去分词done属于形容词类!
②done同时拥有两层暗示 ⑴完成 ⑵被动
因为done的特性，在其简化后会出现语法正确，但句意错误的现象，为此我们需要做出其他改变！看例子！
例1:
①Beer is most delicious.
①啤酒最可口。
②Beer is chilled to 6℃.
②啤酒被冰到6℃。
合并
①Beer（beer is chilled to 6℃）is most delicious.
①Beer which is chilled to 6℃ is most delicious.
简化
①Beer chilled to 6℃ is most delicious.
简化过程
原句:Beer which is chilled to 6℃ is most delicious.
①去掉which↓，因为which与Beer重复了！啰嗦！
Beer is chilled to 6℃ is most delicious.
②去掉is↓，因为be动词是联系动词，并无实意，简化就是要去掉那些无关紧要的！！
Beer chilled to 6℃ is most delicious.
③短语 chilled to 6℃是形容词短语，修饰主语Beer。它继承了形容词从句的语法特性（形容词性）！从意思来讲，chilled to 6℃本身同时拥有完成与被动暗示，即“被冻到了6℃”，与原句 which is chilled to 6℃并无太大差别！与主句并无意思上的冲突，所以可用！
例2:
①The secretary went home.
①秘书回家去了。
②she had finished the day's work.
②她做完了一天的工作。
合并
①after she had finished the day's work, the secretary went home.
简化
①Having finished the day's work ,the secretary went home.
简化过程
①去掉after↓,因为它在此句中并无太大意义！时间逻辑和因果逻辑是人类默认的两大逻辑！
she had finished the day's work,the secretary went home.
②去掉she ↓，因为she 与the secretary重复了！啰嗦！
had finished the day's work,the secretary went home.
③去掉have↓,因为have只是完成时的时间助动词而已，并无实际意思！
finished the day's work , the secretary went home.
④上句↑语法正确，但句意出现错误。因为finished同时拥有完成与被动的意思，而原状语从句she had finished the day's work只有完成的意思，不能出现秘书被完成的意思！所以需要做出改变！
⑤因为原状语从句只能有完成意思，所以请回完成时的时间助动词 have↓，虽然它并无实际意思，但有它能准确表达完成时！
had finished the day's work,the secretary went home!
⑥此时的句子↑是个错句！因为had finished做为实意动词不能放句首！解决办法就是转变词性。即had finished → having finished.
doing形式的词组具有形容词（现在分词）或名词（动名词）词性。此处我们选用现在分词！用来修饰the secretary! ↓即现在分词短语做状语（传统语法所讲）！能做状语是因为它本就是状语从句的简化！
Having finished the day's work,the secretary went home.
⑦其实还有更好的简化↓。
After the day's work ,the secretary went home.
例3:
①The vase auctioned（拍卖） now is a Ming china（瓷器）.
①正在拍卖的花瓶是明朝的瓷器。
上句↑是错句，从语法来看是对的，是形容词从句的简化，但从句意上来说就不对了！
auctioned作为过去分词done形式同时拥有完成与被动的意思，但句意是花瓶“正在”拍卖，还没有卖掉！读者可能产生误会！
所以需要转变auctioned→ be auctioned（动词），这样就只有被动意思了！但句子出现双谓语！
所以再变be auctioned→being auctioned（现在分词词组，“正在”），being auctioned作为形容词组修饰主语the vase,符合要求！↓
The vase being auctioned now is a Ming china.
