=「Mandy isn't as smart as Ethan.」=「Mandy isn't smarter than Ethan.」=「Mandy is stupider than Ethan.」(蔓蒂没比伊森聪明)。
副词.副词的比较级由其原级变化而来，变化方法如下：副词比较的用法和形容词大致相同，基本的副词比较级句型为「主词1 + 一般动词 + 副词比较级 + than + 主词2 (+ 助动词)」，例如："“Tom can speak Japanese better t