as…as…连接两个时间状语从句的用法

问题描述

His expression is as earnest when he smiles as when he is arguing. 他不论笑的时候还是争论的时候表情都同样真诚。
我对上面句子的结构不是很理解，这个 as…as… 怎么连接的是两个时间状语从句呢？但严格说来，所不像是连接两个状语从句，因为前面一个 as 后面还有一个形容词 earnest。请专家老师分析讲解一下，非常感谢！

老师答疑

张老师：

His expression is as earnest when he smiles as when he is arguing. 他不论笑的时候还是争论的时候表情都同样真诚。
【参考解析】这是as 从句的省略结构，在as…as结构中，当第二个as用作连词引导从句时，如果此从句是复合句,那么这个复合句的整个主句可以省略。所以你的句子完全句为：
His expression is as earnest when he smiles as it is when he is arguing. 他不论笑的时候还是争论的时候表情都同样真诚。
如果我们把 when 从句改为一个普通的时间状语，可能就更好理解一些：
I’m just as busy today as I was yesterday. 我今天和昨天一样忙。
【相似例句】
1. I told her I had never been in so many hotels in my life as since I came to Europe.
= I told her I had never been in so many hotels in my life as I had since I came to Europe.
我对她说我一生中从没象我到欧洲后住过张扬多的旅馆。
2. They had been talking for three hours without interruption and the President looked as fresh and alert as when they had started.(=as he looked when…) 他们连续谈了3个小时,总统看上去仍象谈话刚开始的时候一样,精力充沛,思维敏捷。
3. Bella came out of prison as haughty as when she went in. 贝拉从监狱出来，一如当初进去时一般傲慢。
4. Ibrahim left as bewildered as when he arrived. 跟他来时一样，易卜拉欣满腹狐疑地离开了。

l老师：

第一个 as 是副词，修饰形容词 earnet，第二个 as 是连词，引导比较状语从句，状语从句是来修饰第一个 as 的。