1、so that
conj.因此;以便
例句:You have to carry a bleeper so that they can call you in at any time.
你要随身带着寻呼机,以便他们随时呼你。
2、so as to
以便;为使
例句:It is high time that the issue were to be solved so as to promote the economic development.
为了促进经济发展到该解决问题的时候了。
3、for
prep.(表示对象、用途等)给,对,供;以帮助;为了;关于
conj.因为;由于
例句:This is a cynical manipulation of the situation for short-term political gain
这是为了获取短期政治利益而损人利己地对局势进行操纵。