as和than加过去分词的问题

①You shouldn't give a child more money than needed.

②We will do works as planed.

③I don't have such a pen as needed.

各位专家老师们，我想知道的是as和than加过去分词的用法是限于as和than分句的哪一种类型，比如在现代语法as和than划分为了比较从句，到了传统语法as和than被划分到了定语从句，同时as又分为了非限定语从句和限制性定语从句。

但是在as和than+过去分词的用法中呢，如果as按照传统语法划分为限制性定语从句则不可以用直接加ed分词的用法，因此句③错误，如果as作非限定语从句则可以。（记得原来在哪篇文章看过，不确定）

同时还有as加形容词的用法，这种用法是否把as看成了介词，省略了being？

烦请各位老师不吝赐教，谢谢!

所以这几个句子用现代语法比较分句解释比较好。

①You shouldn't give a child more money than needed.

= You shouldn't give a child more money than is needed.

= You shouldn't give a child more money than it is needed to give him.

it为形式主语，不定式为外置主语（真正主语），形式主语和外置主语可以同时省略。然后is可以进一步省略。than needed为比较级more的补足语。

②We will do works as planned.

= We will do works as is planned.

= We will do works as it is planned that we should do.

it为形式主语，that从句为外置主语。形式主语和外置主语可以同时省略，得到as is planned。is可以进一步省略，得到as planned。

as planned 为比较分句作方式状语

③I don't have such a pen as needed.

= I don't have such a pen as is needed.

such a pen为比较项，其对应性在比较分句做主语是必须省略的。is可以进一步省略。as needed为比较分句作such的补足语。

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 2021-10-17 00:02

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