'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。
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。
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。
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。
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。
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。
The present perfect is almost a kind of present tense.
现在完成时总是一类现在时态。
He wants to know what situation calls for use of the perfect tense.
他想知道在什么情况下需要用完成时态。
We use the future perfect tense to talk about an action that will be completed at a given time in the future.
我们用将来完成时态来形容一个在未来特定的一个时间已经完成的动作。
We use the future perfect continuous tense to talk about how long an action will be going on at a future time.
我们用将来完成进行时态来形容一个行动在未来特定的时间里已进行多久了。
There is no exactly equivalent French tense to the present perfect tense in English.
法语里没有和英语中的现在完成时完全对应的时态。
To grasp the usage of the tenses, including the present, past, future tense and continue, perfect tense.
掌握现在时，过去时，未来时， 进行时， 完成时的各种用法。
Fill in the blanks with the present perfect tense of the verbs in brackets.
用括号里动词的现在完成时态来填充空格。
We use the present perfect tense to talk about things that started in the past and still have some connection with the present.
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。
When we make a present perfect sentence, we could usually make a present tense sentence about the same situation.
造现在完成时的句子，我们通常会造现在时态的句子。
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.
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。
In English learning, it is difficult for learners to master the tense, especially the past tense and the present perfect tense.
英语学习中，时态的学习和运用对学习者尤其中低水平学习者来说是一个困难之处。
To grasp the usage of the present perfect tense.
掌握现在完成时态的用法。
You'll be able to use the present perfect tense for checking up.
你可以用现在进行时态去检查。
In this lesson, we will practice using the present perfect tense.
在这节课上，我们将要练习使用现在完成式。
French tense to the present perfect tense in English.
法语中没有和英语的现在完成时完全对应的时态。
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.
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。
The present perfect tense emphasizes the effect of the past action on the present.
现在完成式强调过去所发生的事情对现在的影响。
It is not easy to learn to use the present perfect tense correctly.
学习正确使用现在完成时不是容易的事。
There are three kinds of shapes of the tenses in the Utopia Novels of the later Qing Dynasty: the future past tense, the future perfect tense and the future continuous tense.
晚清的乌托邦小说在时间构形上通常表现为“将来过去时”、“将来完成时”和“将来进行时”等三种不同面相。
At Sotheby's, the room was packed for what proved to be a white-glove, or perfect, sale, with bidders battling for almost every lot in a tense atmosphere.
在苏富比拍卖场上的拍品可谓珍奇荟萃，堪称完美，几乎每件拍品都会掀起一股激烈的竞标大战。
To grasp "the Present Perfect" and the Irregular verbs' past tense &past participle tense.
中文意思：掌握现在完成时态以及不规则动词的过去时态和过去分词…
To grasp "the Present Perfect" and the Irregular verbs' past tense &past participle tense.
中文意思：掌握现在完成时态以及不规则动词的过去时态和过去分词…
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