'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。
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。
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。
All the heavenly entities, the Amesha Spentas, instructed Zarathushtra in heaven, and he received perfect knowledge of past, present, and future.
所有的天体，AmeshaSpentas，在天上教导扎拉·图斯·特拉，他获得了过去，现在，未来的完美知识。
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。
Review the past, look into the future, We run ture to form get rid of the fresh , and strict to themselve. perfect after service supplyed the customers the better ware manufacturer.
回顾过去，展望未来，我们将一如即往，不断推陈出新，严格要求，完善的售后服务，为广大消费者提供更高档的卫生洁具产品，不断改善和提高居家生活品质。
Review the past and look into the future, we supply our customer with sincere attitude, good quality and perfect service for the goal of building mutual benefit and growth.
回顾过去，展望未来，我们以真诚的态度，优良的品质，完善的服务满足客户，为客户创造利益共同成长。
Review the past and look into the future, we supply our customer with sincere attitude, good quality and perfect service for the goal of building mutual benefit and growth.
回顾过去，展望未来，我们以真诚的态度，优良的品质，完善的服务满足客户，为客户创造利益共同成长。
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