【句法分析】该句中含有“so+adj./adv.+as to do sth.”结构,该结构表示结果,否定形式用“so+adj./adv.+as not to do sth.”。
【考点聚焦】①“so+adj./adv.+as to do sth.”可与句型“so+adj./adv.+that...”进行转换。
②so as to do“以便做某事”,表示目的,so as可省略,相当于in order to do。其位置一般在句中,不能位于句首。否定结构用so as not to。
③“such as to”和“such+n.+as to”表示结果,否定结构是在to前加not。
She was so kind as to help the old lady off the bus.
她很好心,把那位老妇人扶下了公共汽车。
Their anxiety was such as to make them unable to sleep.
他们如此焦虑,以至于难以入睡。
My friends were so kind as to help me out.=My friends were so kind that they helped me out.
我的朋友如此善良,帮我摆脱了困境。
【即时巩固】单项选择题
Our research has focused on a drug which is so powerful ________ able to change brain chemistry.
A. as to be
B. as not to be
C. as being
D. as not being
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