什么时侯 to do不定式表目的?什么时候有别的用法?

动词不定式（to do）可以作如下几种状语：1）目的状语 in order to do sth.so as to do sth.to do sth.2）程度状语（也有说成表示程度的结果状语） adj./adv.+ enough + to do sth.too + adj./adv.+to do sth.so + adj./adv.+ as + to do sth.（注意不要遗漏as） such + adj.+ a/an c.n.(单数)/c.n.(复数) + as + to do sth.3）出其不意/出乎意料的结果 only/never + to do sth.I arrived at the station only to find the train had left.对比：预料之内的结果用分词作状语 I slipped,breaking the vase.