- 说明动作“何时”、“何地”、“如何”发生,或者说明形容词或副词的程度,一般由副词、介词短语、不定式、状语从句等充当。
I was not born yesterday.（我又不是昨天才出世的娃娃。）
For many of these families a college education was something new.（对其中的许多家庭来说,大学教育是件新事物。）
He woke up to find his house on fire.(他醒来发现房子着火了。)
You cannot leave until your work is finished.(在你的工作被完成以前你不能离开)
