现在完成时在第8单元讲解。
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.
现在完成时总是一类现在时态。
(现在完成时)这里出过许多事故。
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.
学习正确使用现在完成时不是容易的事。
It is not easy to learn to use the present perfect tense correctly.
我一读完就把书还回去。(现在完成时)。
我一读完就把书还回去。(现在完成时)。
记住一定要用现在完成时。
现在完成时和过去完成时都属于完成时态。
The present and past perfect tenses both belong to the perfect tense.
大部分的语法都是一般过去时和现在完成时。
它们是用作现在完成时和过去完成时的助动词。
They are used as auxiliaries to the present and past perfect tenses.
法语中没有和英语的现在完成时完全对应的时态。
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.
法语里没有和英语中的现在完成时完全对应的时态。
There is no exactly equivalent French tense to the present perfect tense in English.
(现在完成时)1980年以来，我一直住在鞍山。
造现在完成时的句子，我们通常会造现在时态的句子。
When we make a present perfect sentence, we could usually make a present tense sentence about the same situation.
与现在完成时相比，它强调动作继续进行或刚刚结束。
My daughter has been working here for five years and will continue doing so.
现在完成时。
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.
玛丽，其实现在完成时练习。别看电视了，该到做作业的时辰了。
玛丽，其实现在完成时练习。别看电视了，该到做作业的时辰了。
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