PEU 没有讲错 也没有矛盾啊 如同上面我回的那篇一样 as 有两个词性 1. as 当conjunction 时後面的 作主词用的代名词跟be动词 可以去掉 此时的as 是conjunction as (conj.) + (it is) + ready/necessary/agreed 2. as 被当作"主词"时候 其後面必须加动词(主动式) 或 be + Vpp (被动式) 此时 be不可省 as (S.) was agreed NOT as it was agreed 上面的意思是说当as 是当作主词S的时候 "不能用" as it was agreed , 因为这时候的as 是要被说成是当作conj. 连接词 "不是"被当作S主词 如果你说as it was agreed 的as 是主词的话 那这句话不就变成"双主词"了?? 那就不对了 因此 PEU 必没有说错喔! 总结: as 当连接词 as it is necessary /agreed = as necessary /agreed as 当主词 as is necessart / agreed , be动词 不能省 ※ 引述《scju (QQ)》之铭言： : 大家好，请教一下： : 在Practical English grammar 3rd 177.11说： : Subject pronouns with forms of "be" can be left out after certain : conjunctions, especially in a formal style. : 例句： : Start when ready. (= ... when you are ready.) : Phone me if (it is) necessary. : I'm enclosing my cheque for ￡50, as agreed. : 而在518.1则说： : Common expressions with "as" in place of a subject: as follows; as was : expected; as was agreed; as is well known. : 例句： : I am sending you the bill, as was agreed. (NOT ... as it was agreed.) : ----- : 问题来了，我们可以看到这两句根本就是同样的句型： : I'm enclosing my cheque for ￡50, as agreed. : I am sending you the bill, as was agreed. : 如果177.11说第一句可以看成是省略as後的主词及be动词，那就可以还原回去，变成： : I'm enclosing my cheque for ￡50, as it was agreed. : (因为177.11的前面两个例句也都可以还原) : 可是在518.1却又说 : I am sending you the bill, as was agreed. (NOT ... as it was agreed.) : 但这明明就是同样的句型，177.11说主词、动词可以还原， : 而518.1却说(NOT ... as it was agreed.)，似乎有些自相矛盾？ : 照书中的逻辑来看，在这个句型里，下列三者应该是通用的啊？ : ...as agreed. : ...as it was agreed. : （这两者的关系是as後面有无省略主词、动词） : ...as was agreed. : （这则可以理解成as是准关系代名词，代替主词it） : 请教各位怎麽看？谢谢。 --

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