as required 的完整形式是什么

Do exercise as often as required.

请问这里的 as required 是由什么省略来的？它的完整形式是什么？谢谢！

▲同意前面两位老师的解答！我觉得根据require这个动词的搭配特点，as required可以有不止一种补全方式。

1. 根据 require sb to do sth 这一搭配，我们可以将其作如下补全：

Do exercise as often as (you are) required (to).

2. 根据 require that-clause 以及 it is required that-clause 这一搭配，我们可以将其作如下补全：

Do exercise as often as (it is) required (that you should (do)).

▲类似的用法再如 as expected。如：

He didn’t do his work as well as expected.

补全方式一：

He didn’t do his work as well as (he was) expected (to).

补全方式二：

He didn’t do his work as well as (it was) expected (that he would).

蒋红秀 - 英语教师

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刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编 1秒前

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Do exercise as often as required.

【答】在as 之后省略了is，完整的表达是：Do exercise as often as is required.

我认为，“比较代词”as 替代整个主句的内容，相当于that you do exercise often. 只有这样理解，require 才讲得通：We require that you do exercise often.

Do exercise as often as is required. 不同于 Do exercise as often as I do it. 因为在as I do it中，省略的“比较对应项”是often，由as充当。完整的说法是：I do it often.

曹荣禄 1秒前

擅长：动词用法,句法问题

补全后的比较分句是：

Do exercise as often as it is required that you should (do). as作为比较代词，替代了频度副词aften,在that从句中作频度状语。