引导状语从句，例如：
1、We now have a small window of opportunity in which to make our views known.我们现在有一线机会使人了解我们的观点。
2、This delay gives the party a breathing space in which to sort out its policies.这一延误使该党有了喘息之机来厘定其政策。
3、He has four weeks in which to lodge an appeal.他有4个星期的时间提出上诉。
There the children had a garden in which to play.
在那孩子们有个玩耍的花园
