不定式作状语

　　1）目的状语

　　To… only to (仅仅为了),　in order to,　so as to,　so(such)… as to… (如此……以便……)

　　He ran so fast as to catch the first bus.　他飞快地跑以便赶上第一班车。

　　I come here only to say good-bye to you.　我来仅仅是向你告别。

　　2）作结果状语，表事先没有预料到的，要放在句子后面。

　　What have I said to make you angry.

　　He searched the room only to find nothing.