英语语法大全 | 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。