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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.

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Rewrite the following sentences using the Present Perfect Passive Voice.

用现在完成时的被动语态改写下列句子.

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Explain and illustrate the main use of the present perfect tense.

解释并举例说明现在完成时态的用法.

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Explaining some topic already obtained uses present perfect tense.

说明某个课题现在已经取得的成果,适宜采用现在完成时.

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The tense is present perfect progressive.

进行时)(现在,过去,将来,现在完成-进行时 )

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Past simple or present perfect?

一般过去时还是现在完成时?

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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.

《简明英汉词典》

To grasp the usage of the present perfect tense.

掌握现在完成时态的用法.

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Sum up the new vocabulary in this Unit, and Present Perfect Tense.

明确本单元所学的词汇和语法,增强他们正确操作的能力.

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