【句法分析】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
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
make them unable to sleep.
他们如此焦虑,以至于难以入睡。
My friends were
help me out.=My friends were 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Our research has focused on a drug which is so powerful ________ able to change brain chemistry.
A. as to be B. as not to beC. as being
D. as not being
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