'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。
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。
I want to tell you about the past, present and future of the human population. So let's start with a few problems.
我想告诉你们有关人口数量的过去、现在和未来。那么让我们从一些问题入手。
Worry, by its very nature, means thinking about the future—and if you hoist yourself into awareness of the present moment, worrying melts away.
忧虑，就其本质而言，意味着思考未来——如果你把自己提升到对当下时刻的意识中，忧虑就会化为乌有。
I want to tell you about the past, present and future of the human population, so let's start with a few problems.
我想告诉你们关于人类的过去、现在和未来的事情，所以让我们从一些问题入手。
The present, the future and the past are always tied together and are always with us.
现在，将来，过去，这三者总是连在一起也总是伴随着我们的。
The findings of this sociologist are very interesting because they illustrate once again the relationship that exists between what we do in the present and the results we obtain in the future.
这个社会学家的发现是非常有趣的，因为他们在一次的说明我们现在做的和我们未来获得的结果有关系。
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。
Worry, by its very nature, means thinking about the future-and if you hoist yourself into awareness of the present moment, worrying melts away.
担心，由于其本身的性质，意味着考虑未来——如果你把自己提升到当下时刻的意识里，担心就化为乌有了。
Regular, consistent contact with business units will help you keep an eye on the future even as you design and build for the present.
即使您目前正在进行设计和构建，与业务单位进行定期、一致的联系也会帮助您密切关注将来。
It is also helpful in knowing each other's plans about money for the present and the future, to help eliminate any financial obstacles and misunderstandings that might arise.
了解了对方现在以及将来的用钱计划是很有用的，它可以帮助清除一些财务上和障碍，消除日后可能产生的一些误解。
Entertaining though it is, the Newseum is not the place to go for unbiased reporting on the past, present and future of the press.
无论是过去还是将来，拟或是现在，新闻博物馆不再是报道那些毫无偏见观点的地方了。
ANSWER: This paradox is explained by God being outside of time-he knows the future just like he knows the past and the present.
回答：这个悖论可以用上帝存在超越时间来解释——他可以知道未来，就如同他知道过去和现在。
Without imagination, one couldn't get from knowledge of the past and present to justified expectations about the complex future.
如果没有想象，一个人无法从过去和现在获得知识来证实对复杂未来的猜想。
WINSTON CHURCHILL once said that he “preferred the past to the present and the present to the future”.
温斯顿.丘吉尔曾说“对于现在他更喜欢过去而对于将来他却更喜欢现在”。
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。
We shall help you to update the present and future technology concerned with the production from time to time.
我们将不时地帮助贵方更新与生产有关的现有和将来的全部技术。
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。
Ms Westwood said: "Through my reworking of the traditional robe I tried to link the past, the present and the future."
维斯特伍德说：“通过我对传统学位礼袍的重新设计，我尝试把过去，现在和未来联系在一起。”
As previously mentioned, a big part of choosing the right solution is weighing the specific needs of your enterprise, both in the present and in the foreseeable future.
如前所述，选择适当的解决方案时，大部分要做的工作就是衡量您企业的特定需求，包括目前的需求和可预见的将来的需求。
Indeed the past must be changed to prevent the energy and trauma from over-bleeding into the present and future, in linear terms.
事实上，必须改变过去以防止能量和创伤因过度伤痛而延伸到线性时间的现在和未来。
Nerds tend to spend a lot of time in the past and future, but to achieve happiness you have to cultivate the skill of living in the present.
书呆子们总是浪费很多时间试图生活在过去和未来，但为了得到幸福，你必须培养生活在当下的能力。
The data that must remain the primary focus of attention for SOA are the data produced, consumed and managed by business systems that represent the past, present or future state of the enterprise.
在SOA中仍然必须重点关注的数据是，由那些代表企业过去、现在或未来状态的业务系统产生、消费和管理的数据。
If economic and trade cooperation represents the present day, cultural and educational exchanges mean the future.
如果说经贸合作代表着今天，那么文化和教育交流就意味着未来。
Transactions became more complex, involving for instance the right to buy and sell goods in the future at a price fixed in the present.
交易变得越来越复杂，例如包括了类似在将来买入某种货物的权利，而价格则是目前讲定的。
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。
Measuring economic costs weighs the expense of both vaccination and illness against the net present value of the future earnings of someone who would otherwise die from the disease.
即通过接种疫苗和治疗的成本与那些若不给予治疗生命危在旦夕的人将来收入的净现值之比来估量经济成本。
I only cared about being on time for my next appointment and thinking ahead the future without concentrating on the present.
我只会想着还没发生的将来，担心能否赶得上下一场约会，却忽视了当下的工作。
I only cared about being on time for my next appointment and thinking ahead the future without concentrating on the present.
我只会想着还没发生的将来，担心能否赶得上下一场约会，却忽视了当下的工作。
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