现在完成时
词型变化:名词复数形式 : present perfects

present perfect的用法和样例:

例句

  1. 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。
  2. 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。

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