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.
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.
(现在完成时)大多数问题已经圆满解决了。
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.
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.
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.
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.
现在完成时也用于长久的行为和状态其始于过去而持续到最近。
The present perfect is also used for long actions and situations which started in the past and went on until very recently.
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.
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.
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.
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.
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.
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.
乍看起来，在现在完成时的用法中，似乎跟在一般过去时中一样，都没有“涉及现在”的因素。
At first glance it looks as if there is no element of "present involvement" in this use of the present perfect any more than in the simple past.
要谈论行为或状态其始于过去而持续到现在，经常使用现在完成时表现过去和现在之间的连接。
When we want to talk about actions or situations which started in the past and have continued up to the present, we often use the present perfect to show the connection between past and present.
现在，你的问题大概更基础：发音上的错误，小词汇量，现在完成时的和条件句的结构的语法问题。
Right now, your problems are probably more basic: mistakes in pronunciation, small vocabulary, grammar problems with the present perfect tense and conditional structures.
你学习了过去时，然后两到三周后你开始学习现在完成时，几周以后你又开始学习将来时，这简直太疯狂了。
So you learn the past tense and then two or three weeks later, oh now you are learning the present perfect, and then a few weeks later, you are learning the future, that's crazy.
下面的这些句子摘自课文，仔细地研究这些例句，特别要注意现在完成时句子中表示时间的状语（用斜体印出）。
These sentences are from the passage. Study them carefully. Pay close attention to the words in italics.
本研究旨在探究母语为汉语的学生在习得英语现在完成时态时，其过渡语中母语时体特征的表现方式、存在原因和发展趋势。
The present study focuses on three parameters according to the three Characteristics of the Chinese Temporality (CCTs): time-phrase influence, time-space influence and tense choice.
英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
The use of tenses in English also is better to concise, commonly used present tense, the past tense, use less when completed, the past is finished now, tense and other composite tense basic need not.
我给自己的定位是做一个笃行务实的老师，与其在工作中一直说“将来时”，我个人更倾向于使用“现在进行时”或者“现在完成时”。
I want to be a practical teacher, so when I am working, I prefer to use'the Present Continuous Tense'or'the Present Perfect Tense'instead of'the Future Tense.
研究还发现，学习者对于语法学习的观念与策略影响其克服母语负迁移能力的提高和英语时间概念的建立，从而影响其英语现在完成时的习得。
The research also finds that learners' beliefs about and strategies for English grammar learning affected the increasing of the level of ability to overcome the negative L1 transfer.
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。
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。
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.
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