不定式作状语常常表示目的和结果:
________a teacher in the university， it is necessary to have at least a master's deGREe.
A） To become B） Become
C） One become D） On becoming
想在大学里当教师，至少要有硕士学位。(B4， 1995.1-48， A 对。To become a teacher in the university 是表示目的的状语。）
Guards were stationed along the route to protect the salt against thieves. 沿着盐的运输线路驻扎了军队,以防盗贼。
He lived to see the liberation of his hometown. 他活到了看见家乡的解放。（ to see the liberation of his hometown 表示结果）
“ so as to ”也用来表示目的,意思是“以便……”:
The test questions are kept secret， so as to prevent cheating.试题是保密的,以防作弊。
注意如果是否定,not 置于to 不定式之前:
Tom kept quiet about the accident________lose his job.
A） so not as to B） so as not to
C） so as to not D） not so as to
（1990年高考题，B对） 汤姆为了不丢掉这份工作,对事故缄口不言。
They got up early in order to catch the train / in order not to miss the train. 为了赶上火车(为了避免赶不上火车),他们起了个大早。
而 only 与不定式连用则表示一种没有预料到的、令人失望的结果:
GREatly agitated， I rushed to the apartment and tried the door，_________to find it locked.
A） just B） only C） hence D） thus
（2000年考研第2题,B对） 我非常不安,冲向公寓,推了推门,结果发现门是锁着的。
The mother loves her children and let them have their way only to spoil them. 母亲很爱孩子,对孩子放任自流,结果反而宠坏了他们。
He survived the crash only to die in the desert. 他在飞机坠落中没有死,却死在沙漠里。
He tried many times to sneak across the border to a neighboring country， only to be caught each time. 他多次试图偷越国境到邻国去,结果每次都被抓回来。
