【原】as and when 的用法，鲜为人知

达人分享

as 和 when 都可以引导时间状语从句，意思相近且是同义词，那你是否用过这个组合 as and when 呢？它跟 if 和 when 的组合类似，常用于陈述要求、义务、条件和必要性等，相当于连接两个从句，是一个习惯用语，用来指不确定的未来事件，意为“到…时候”，它所表达的意思：

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at the time when (used to refer to an uncertain future event)
当时（用于指不确定的未来事件）
at the time that something happens
当事情发生的时候
at the time when something required
在需要的时候
at the exact time when something will happen
什么时候会发生什么事

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例如：
Most people in this city don't own a car - they just rent one as and when they need it.
这个城市的大多数人没有汽车，他们只是在需要的时候租一辆。
We will inform you as and when your order will be ready.
我们会在您的订单准备好时通知您。
解析：为了便于理解，可以把此句改成 We will inform you as your order will be ready and when your order will be ready.

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We will update the information on our website as and when required.
我们会在需要时更新我们网站上的信息。
I always explained everything to my boss about the status of project as and when he asked.
我总是在老板要求的时候向他解释项目的进展情况。
I never go to the cinemas, I just watch the movies at home as and when I need.
我从不去电影院，当我们需要看时，我就在家里看电影。

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He always carries with him a pocket diary and note down the thoughts as and when they comes to his mind.
他总是随身携带一本袖珍日记本，并在想法涌上心头时记下它们。
As and when the time comes we will go there to see the results.
到时候我们会去看结果。
My dream is to create a virtual book that can deliver, wrap and record an individual's learning as and when they need it.
我的梦想是创建一个虚拟的书，可以在需要的时候提供、包装和记录个人的学习。

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Banks store and obtain the signature of owners as and when required.
银行储存业主的签名，并在需要时获得它。
虽然语法上很难解释为什么 as 和 when 还可以组合使用，但是习语就是习语，反正记住 as and when 就是“到…时候”的意思就可以。
You will know how to use the idiom "as and when" as and when required.
到需要的时候你就知道如何使用习语 an and when 了。

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