介词+which/whom to do结构一般充当定语修饰名词。如：
This is a knife with which to cut watermelons.
这是一把西瓜刀。
She must have time in which to grow calm.
她必须有冷静下来的时间。
Allow me one minute in which to change my costumes.
给我一点时间来卸装。
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。
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。
There was no strong organizational base on which to build.
缺乏一个坚实的组织基础。
Agriculture and industry are the base on which to build up the nation.
工农业乃立国之本。
There are probably decades in which to plan for the arrival of super intelligent machines ．
未来还有几十年可以用来规划超级智能机器的诞生。
It is the easiest country in which to find a job.
这是最容易找到工作的国家。
Diners have millions of options from which to choose.
食客有数百万种选择。
He has four weeks in which to lodge an appeal.
他有4个星期的时间提出上诉。
Officials say the options will offer investors a longer time in which to accrue profits.
官员说这些期权会给投资者提供更长的利润积累期。
You'll have four months in which to lick the recruits into shape.
你将有4个月的时间把这些新兵训练出来。
We will then have a firmer foundation of fact on which to build theories.
那样我们将会获得一个建立理论所需的更为牢固的事实基础。
The post will give him a powerful political base from which to challenge the Kremlin.
这个职位将给他提供一个强有力的政治基点来挑战克里姆林宫。
The two hotel-restaurants are attractive bases from which to explore southeast Tuscany.
对于去托斯卡纳东南部探险的人们来说，这两家酒店是很有吸引力的驻扎地。
Washington struck me as a precarious place from which to publish such a cerebral newspaper.
我的感觉是，在华盛顿出版这样一份理性的报纸不是太靠谱。
She had never had a real boyfriend before and so had no yardstick by which to compare Charles's behaviour
她以前从没有过真正的男朋友，所以没有可参照的标准来对比查尔斯的行为。
We guarantee that you will find a community with which to socialise
我们保证你们会找到自己的交际圈。
Atlanta was voted the best city in which to locate a business by more than 400 chief executives.
逾400名行政总裁投票推选亚特兰大为最适宜开办公司的城市。
Mother, you cannot tell me whom to love and how to live my life.
妈妈，你不能吩咐我该爱谁该怎么生活。
That young man was bewildered as to whom to believe.
那个年轻人给搞糊涂了，不知道该相信谁。
We can’t decide whom to invite.
我们不能决定邀请谁。