1.for a rainy day 为着有朝一日困难时未雨绸缪
例句：I have some money staked out for a rainy day.
我存了点钱，以备不时之需。
2.for a time (或 while) —会儿，一段时间
例句：Then, for a time, while I was living with Dr. Scott and attending lectures at the University College, I lost touch with the widow.
此后有一段时期，我住在司各特博士家里，在伦敦大学学院听课，和这位寡妇就断了直接的联系。
3.for all the world 不管怎样，无论如何
例句：I will chase my dream for all the world.
不管怎样，我都会追求自己的梦想。
4.for better or worse 不管是好是歹，不论是福是祸
例句：Simple ideas are dangerous because they can change the world, for better or worse.
简单的观点是危险的因为这可以改变世界，变好或者变差。
5.for fear of 生怕，以免
例句：And parents around the country walk along their young children for fear of their safety.
这个国家的父母都围在孩子的身边，因为担心他们的安全问题。
6.for free 免费地，无偿地
例句：We will do the installation for free. Because we appreciate your business.
我们会免费替你安装，因为我们很感谢你的生意。