'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。
Ihad finished 'is an example of the past perfect.
“我过去已经完成了”是过去完成时态的一个例句。
Learn to express something with Past Perfect Tense.
学习使用过去完成时态。
Most of the grammar is just past simple and past perfect.
大部分的语法都是一般过去时和现在完成时。
Most of the grammar is just past simple and past perfect.
大部分的语法都只是一般过去时和过去完成时。
Most of the grammar is just past simple and past perfect.
大部分的语法都是普经过去时和如今完成时。
They are used as auxiliaries to the present and past perfect tenses.
它们是用作现在完成时和过去完成时的助动词。
The present and past perfect tenses both belong to the perfect tense.
现在完成时和过去完成时都属于完成时态。
B. Fill in the blanks with the past perfect or simple past tense of the verbs in brackets.
试用括号里动词的过去完成时态或一般过去时态来填充空格。
Lin Yutang 's personality shaped the past perfect modality of China' s cultural transformation on individual level.
林语堂的人格是中国文化转型在个体层面的完成时形态。
We use the past perfect continuous tense to show that an action started in the past and continued up until another time in the past.
我们用过去完成进行时态来形容一个在过去开始的行动，这个行动持续到过去的另一个时间。
When you ask about something that started in the past but continues to the present time, you use the Present Perfect tense, e.g.: I’ve been there for 5 years / I’ve been there for 5 years.
当你谈论在过去开始但是一直持续到现在的某事时，用现在完成时态，例如：I’vebeentherefor5years/我在那里已经5年了。
We take what the market gives us, not creating a system from past charts to try to figure out the PERFECT target of pips to grab.
我们是在交易市场给我们的，而不是从过去的图表中找出重复，以此找出我们所需要的完美目标点位来交易。
For Xiaojian, at 28 years is just past the ideal marriage age here, it seemed like a perfect solution.
对肖建来说，二十八岁只是刚刚过了当地的理想结婚年龄，看起来这是一个不错的解决方案。
The following five tips are something that I've learned over the past few months, and they have undoubtedly helped me a lot in improving my emailing skills. I am yet to perfect them though.
接下来的5招小贴士是我过去几个月来习得的一些经验，它们确实提高了我写邮件的技巧，但仍需得到改善，我相信这也只是时间问题。
The book debunks poor science and the cherry-picking of statistical examples to feed hysteria about keeping invasive species out and protecting an imaginary perfect past.
本书驳斥了科学和统计样本选择行为中的谬误，后者认为要抵制入侵物种，保护想象中的完美过去。
Despite Microsoft's limited past success in getting people to hook up a PC to their TV, 2011 might be the perfect time for a new Windows Media Center box.
尽管微软在让用户把个人电脑和电视衔接上的成功非常有限，2011年也许会是Windows媒体中心电视机盒上市的绝佳时机。
Ms Lauvergeon, who is credited with rehabilitating the image of nuclear power over the past decade, is considered the industry's perfect ambassador post-Fukushima.
在过去十年中，Lauvergeon夫人因为恢复了核电站形象而广受好评。她被认为是福岛事件后核工业完美的大使。
It's like a Re-Perfect-your-Past machine, which is why I got it.
它就像一台重新完美化的旧机器，这也是我能得到这台机器的理由。
We will offer you high quality products and perfect after service just as in the past.
我们将一如既往地为广大客户提供优质的产品及完善的售后服务。
We use the present perfect tense to talk about something that happened at an indefinite time in the past.
我们使用现在完成时谈论发生在过去某个不确定的时间的事情。
If we say when a past event happened (for example, by using time-adverbs), we do not usually use the present perfect.
说过去发生的事件(例如：用过去时间状语)，我们通常不用现在完成时。
The past will never come back, even back is not perfect.
过去的不会再回来，即使回来也不再完美。
The past will never come back, even back is not perfect.
过去的不会再回来，即使回来也不再完美。
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