The present continuous tense is formed using the auxiliary verb be+ ( verb) ing.
现在进行时的基本结构是:be+动词-ing。
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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》
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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Do use third-person, simple present or past tense, and active voice.
要使用第三人称 、 简单的现在或者过去时态以及主动语态.
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Need的助动词形式主要用于现在时态的疑问句 、 否定句和条件句中.
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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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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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