第二个as是介词还是关系副词？

问题描述

This dress is twice as expensive as that one. 第二个as是介词还是关系副词？

老师答疑

刘老师：

This dress is twice as expensive as that one. 第二个as是介词还是关系副词？

【答】第一个as是程度副词，类似否定时的so，意为“那样的”；第2个as是从属连词，引导比较从句。as that one等于as that one is。

陈老师：

This dress is twice as expensive as that one. 第二个as是介词还是关系副词？

第1个as为副词

第2个as为连词,在否定句可以用so替换,用来引导比较状语从句

This dress is twice as expensive as that one (is expensive)

这件衣服是那件衣服的2倍贵.

例如: Tom is not so tall as Jack (is tall)

This rope is three times as long as that one (is long)