完成时态

词型变化：名词复数形式 : perfect tenses

perfect tense的用法和样例：

例句

用作名词(n.)

Learn to express something with Past Perfect Tense.学习使用过去完成时态。
The verb must be in the present perfect tense.动词必须用现在完成时态。

【近义词】

perfect完美的
perfective完美的

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