past perfect是什么意思 past perfect怎么读
past perfect的英文翻译是什么意思，词典释义与在线翻译
Noun:- a perfective tense used to express action completed in the past;
"`I had finished' is an example of the past perfect"
past perfect的用法和样例
- 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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