Learn to express something with Past Perfect Tense.
学习使用过去完成时态。
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。
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。
Comparison Compare the difference between the simple past tense and the present perfect tense.
现在完成时与一般过去时所表示的动作或状态都发生在过去，区别…
Comparison Compare the difference between the simple past tense and the present perfect tense.
现在完成时与一般过去时所表示的动作或状态都发生在过去，区别…
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