不定式的特殊句型so as to
1) 表示目的;它的否定式是so as not to do。
Tom kept quiet about the accident so as not to lose his job.
汤姆对事故保持沉默是为了不丢掉他的工作。
Go in quietly so as not to wake the baby.
轻点进去,别惊醒了婴儿。
2) so kind as to ---劳驾
Would you be so kind as to tell me the time?
劳驾,现在几点了。
in order to 可以位于句首也可位于句中,
但so as to不能位于句首。否定句结构用in order not to,比 so as to正式;so as to既可表示目的,又可表示结果,其位置一般在句中,否定结构用so as not to ;so.... as to只能表示结果,否定结构用so.... as not to
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