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。
'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.
仓库的自动配置现在完成了。
The automatic configuration for your repository is now complete.
我们现在完成了对SWTGUI控件的游历。
用现在完成时的被动语态改写下列句子。
Rewrite the following sentences using the present perfect passive voice.
谈论过去的事件其对现在不重要，不用现在完成时。
When we talk about past events which have no present importance, we do not use the present perfect.
(现在完成时)1980年以来，我一直住在鞍山。
现在完成时用来表达开始于过去但仍在现在持续的动作。
The present perfect is used to express an action that started in the past but still continues in the present.
比如，列出你正在学的语法知识的全部形式，如现在完成时。
For example, try to write down each example of a form you are studying such as the present perfect.
一般现在完成时经常用于谈论过去的行为和事件其完全结束。
The present perfect simple is often used to talk about past actions and events which are completely finished.
用动词的正确形式将下面的句子变成现在完成时的被动语态。
Change these sentences into the present perfect passive putting the verbs into the correct forms.
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。
We use the present perfect tense to talk about something that happened at an indefinite time in the past.
如果起诉，通常由起诉人负现在完成时句子责证明案件成立。
If there is a prosecution the onus will normally be on the prosecutor to prove the case.
我们用现在完成时来谈论在过去开始并且仍与现在有联系的事情。
We use the present perfect tense to talk about things that started in the past and still have some connection with the present.
若按普通英语的动词时态规则，就得用一般过去时或现在完成时。
In this case, the past or present perfect tense should be used according to the grammatical rules of common English.
我在内圈赢过一次，我在外圈赢过一次，所以我现在完成了千米了。
I won one on the inner and I won one in the outer, so I, I completed the thousand meters now.
我们经常用现在完成时态来说新闻：尤其常见于报道、信函、会话。
We often use the present perfect to give news: it is especially common in reports, letters and conversations.
现在完成进行时用在短时间的情况，现在完成时用于长时间的情况。
We use the present perfect continuous (I have been doing) for situations over a short time. We use the present perfect (I have done) for situations that exist for a longer time.
现在完成时态是中学英语语法中的重点和难点，经常给师生带来困惑。
As one of the most important and confusing grammatical tenses in high-school English, present perfect tense brings about much perplexity to both teachers and students.
现在完成了主要的组成部分，我们就能用Web 2.0组件对应用进行增强了。
Now, when we have all major building blocks set, we can start enhancing our application with Web 2.0 components.
一些科学家认为一天动物可能被训练做一多由人类现在完成的简单工作。
Some scientist think that one day animals may be trained to do a number of simple jobs that are now done by human beings.
我们也使用现在完成时谈论一系列重复的行为，这些行为到现在还发生。
We also use the present perfect to talk about a series of repeated actions which have happened up to the present.
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。
If we say when a past event happened (for example, by using time-adverbs), we do not usually use the present perfect.
你会发现对于一个母语使用者，他们在问候兄弟时很喜欢用现在完成进行时。
You'll notice that's its very common for a native speaker to use the present perfect continuous like this when greeting a buddy.
本文通过理论和实验相结合的方法，对比分析单、双语人学习英语现在完成体的特征。
By combining theories and experiment, this thesis compares and analyzes the features in the process of learning English present perfect by both Chinese Han students and Chinese ethnic Korean students.
与讨论如何正确使用现在完成时相比，当我们谈起美国大学的生活时，他们显得更为兴奋。
They appear more excited when we talk about university life in the United States than when we discuss the correct usage of the present perfect tense.
英语状态被动语态句型结构可以是一般现在时、一般过去时、现在完成时或者过去完成时。
The English stative passive voice sentences can be the simple present, the simple past, the present perfect or the part perfect.
英语状态被动语态句型结构可以是一般现在时、一般过去时、现在完成时或者过去完成时。
The English stative passive voice sentences can be the simple present, the simple past, the present perfect or the part perfect.
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