相当于名词的成分才可作主语或宾语.being done作主语或宾语时是动名词，相当于名词，而done是过去分词，相当于形容词或副词，不能充当名词的作用，故不可作主语或宾语.
例：（１）Once spoken， a word becomes a promise.一言既出，驷马难追．(作状语）（２）Once poured， water can’t be taken back again.覆水难收．（作状语）（３）Never corner a defeated enemy. 穷寇莫追 ． （４）Impressed by the beautiful scenery， I forgot togo back home in time. 流连忘返．（作状语）（５）A fault once denied(否认) is twice committed(犯)（作表语）.否认错误等于错上加错．（６）A contented mind is a continual feast (宴席）．知足常乐．（作定语）（７）Grief(忧愁） divided is made lighter.分担忧愁能使忧愁减轻．（作定语）You will feel very frustrated if you find yourselfsometimesmisunderstood by (被误解）yourbest friends. (misunderstand)1.及物动词的过去分词称为＿donebeing 加过去分词称为＿ being done.这两者都与逻辑主语构成被动关系．2.在句中担任主语和宾语时，只能用being dong，而不用 done．因为done具有形容词和副词的功能，不具有名词的性质，所以 done不能作主语和宾语 .而 being done既可用作动名词的例子：1.充当主语和宾语．(1)Being caught in a heavy traffic is quite an unpleasant experience.( 作主语)交通拥挤堵车是相当讨厌的经历．(2) He narrowly escaped being run over，．being done 和 done 都能作表语，但 being done的动作意义强，而 done只能表状态．
done可以做主语吗
在某些情况下可以，有一种形式就是……ed is ……ed
比如 ：done is done，其实是 what done is done的简单表示方法，不过不推荐作为书面语言使用
1、having been done表示一个动作发生之前的另一个动作，done也可以。
例：
Having been bitten twice， the postman refused to deliver our letters unless we chained our dog up.
=Bitten twice， the postman refused to deliver our letters unless we chained our dog up.
被咬两次后，邮递员拒绝给我们送信除非我们用绳索把狗儿拴住
Killed， she couldn't stop her blood from going chilled.被杀后，她血流不止
2、但是done做主语的时候不一定等于having been done，也就是说done做主语时范围比较广。done可以表示两个动作的同时性
例：Seen from the hill， the city looks magnificent.
=When the city was seen from the hill， the city looks magnificent.
