不定式作目的状语和作结果状语的区别

不定式做状语用的最多的是目的状语.
1.they will go to the station to meet the guests.
另外不定式还常与in order to， so as to连用做目的状语。例如：
2.in order to catch the train, he hurried through his work.
或 he hurried through his work in order to / so as to catch the train.

而做结果状语只是仅限于learn（得知），find（发现），see，hear，to be told（被告知），make（使得）等具有界限含义的动词。

3.He returned home to learn his daughter had just been engaged.他回家后得知女儿刚刚订婚了。（结果）

而only+不定式常常表示令人不快的结果。
4.i hurried to Professor Wang's house only to find he was out.
我匆忙的感到王教授的家可是却发现他外出了。
与so/such....as to连用，可作目的状语或结果状语，均可。例如：
5.She was so angry as to be unable to speak. 她气的连话都说不出来。
最后too...to...有的语法书上说是做程度状语，但更多的语法书称其为结果状语。这个句型就不用举例子了吧？

从句子结构区别。
I will go there to get my book.（目的）
I spoke English aloud for each of them to hear my words.（结果）