'I have eaten' is the present perfect tense of the verb 'to eat', 'I had eaten' is the past perfect and 'I will have eaten' is the future perfect.
Ihave eaten是动词eat的现在完成时；Ihad eaten是过去完成时；Iwill have eaten是将来完成时。
If the past is prologue, then it ought to be possible to draw some modest conclusions about the future from the wealth of data about America's present.
如果过去是一个序幕，那么应该有可能从有关美国现状的大量数据中得出一些关于未来的适度的结论。
To ensure the future of mankind, it is crucial to draw on our experience from the past.
为了人类的未来，我们必须借鉴过去的经验。
Happiness is not a point of future and not a moment from the past, but a mindset that can be designed into the present.
幸福不是未来的某个节点，也不是过去的某个时刻，而是能够融入到当下的一种心境。
Unless you have a vision for the future, your future is threatened to be a repeat of the past.
除非你对未来有一个愿景，否则你的未来有可能重蹈覆辙。
I have come here not for the past, but for the future, which is centred on offshore oil.
我来这里不是为了过去，而是为了未来，而未来以海洋石油为中心。
Incidentally, there is nothing in Einstein's theory that prohibits time travel, be it into the future or into the past.
顺便一说，在爱因斯坦的理论中没有什么能阻止时间旅行，通过它可以走向未来也能回到过去。
But the shirt made the point. This is a local, protecting angel, whose function is to link the mining past with the future and to focus the hopes and fears of a region struggling out of decline.
但关键就是这件球衣，说明这是一位当地的守护天使，其作用在于把行将被掩埋的历史与未来相连接，使人们关注到这个地区奋斗着走出衰败的过程中的希望和恐惧。
The mystics say that from the point of view of the Eternal, there is no past, present, and future, and that everything coexists simultaneously.
神秘主义者们说，从“永恒”的观点来看，没有“过去”、没有“现在”、也没有“未来”，一切都是同时存在的。
Here, escape is not a preoccupation with the past, but a determined focus on the present and the future that is blind to the legacy of the past which brands us and with which we must live.
在这个领域里，逃避并不是专注于过去，而是要坚决地专注于我们都视而不见的、玷污了我们的名声的过去历史遗留下来的遗产的现在和未来，并且我们必须要赖以生活下去。
I tend to be at my best when my mind is neither engaged in the past failures nor in the future fantasies.
当我的思绪既不沉溺在过去的失败中、也不沉浸在对将来的幻想中时，我的状态最佳。
Yet unfortunately, there is sometimes a sense that old assumptions must prevail, old ways of thinking; a conception of power that is rooted in the past rather than in the future.
但是，令人遗憾的是，有时存在着一种感觉，认为昔日的设想，过去的思维方式一定占上风；一种基于过去而非基于未来的实力观。
Take this moment to remember that the future hasn't happened, the past is gone and the present, the wonderful present, is all we have and all that is guaranteed.
用这一刻记住未来的事还并未发生，过去已经过去而现在，美好的现在，是我们拥有的全部，是我们能够保证的全部。
That's not exactly comforting, nor is the fact that we cannot assume that the past is prologue to the future.
这并不足以让人欣慰，事实是我们不能假设过去是未来的序幕，这同样不能让人欣慰。
But the only certainty about the future of news is that it will be different from the past.
但是有一件事实很清楚的，未来的新闻业将与过去的不同了。
The mind spends most of its time either worrying about the future, or rummaging through the past. Rarely is it grounded in the now.
大部分时间我们的心思不是在为未来担忧，就是在琢磨过去的事情，很少考虑当前的情况，这会平生很多压力。
The past is gone, the future is undefined, but this very minute is yours to enjoy.
过去不再回来，将来无从把握，但我们可以享受现在这一刻的美好。
WHEN the present is perplexing and the future looks bleak, people often seek wisdom in the lessons of the past.
每当现在的状况纷繁复杂而未来又黯淡无光的时候，人们常常去历史的教训中寻找智慧。
Jacquelyn Gill: understanding the past is often the key to understanding the future.
杰奎琳·吉尔：了解过去通常是预知未来的关键。
When you're attempting to plan for the future with an architecture, sometimes the most critical tool you can have is a solid understanding of the past.
当您尝试用体系结构来为将来做规划时，有时您所能拥有的最关键工具是对过去的充分了解。
In many ways, this momentous change is a matter of "back to the future" rather than the definitive end of the past.
在许多方面，这个重大变化是在以前基础上的跃进，而不是过去的全面终结。
The trouble is that, with no consensus about the past, Japan's establishment is inept better future.
麻烦是，对过去没有共识，日本是不能建立更加美好的未来。
If I had to choose, the most important life lesson is summarized to this: life is so short. What's happened is already in the past. The future is here for us to create.
如果我一定要选择一项的话，最重要的一课可以总结为：生命短暂，发生的事情已经过去，未来等待我们去创造。
One of the biggest problem in philosophy is that how do we justify, can we justify this assumption that the future will be like the past.
最大的问题之一是哲学,是我们怎样证实，我们能证实这个论点，即将来就像过去。
The end result is that a cortical fold specialized for the storing of the past is also recruited when we imagine an event 45 days in the future.
最终的结果是，专门储存过去信息的大脑皮质折叠，在我们想像未来45天的事件时也参与其中。
It is with the strength of these emotions, as well as the concrete, glass and steel that is brought in day by day, that we will build on the footprints of the past the foundation of the future.
正是因为这些情感的力量，以及一天天堆积起来的混凝土、玻璃和钢筋，我们在过去的脚印上重新出发，为未来铺平道路。
Our concept of free will is intimately related to the idea that the past may be set in stone, but the future is up for grabs.
我们认为过去已经铁板钉钉，而未来还等待自己去把握。对自由意愿的观念就与此密切相关。
Our concept of free will is intimately related to the idea that the past may be set in stone, but the future is up for grabs.
我们认为过去已经铁板钉钉，而未来还等待自己去把握。对自由意愿的观念就与此密切相关。
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