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 时后面的 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 其后面必须加动词(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.)
: