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。
To grasp the usage of the tenses, including the present, past, future tense and continue, perfect tense.
掌握现在时，过去时， 未来时， 进行时， 完成时的各种用法。
He change verb tenses every time he talked about something. He kept shifting from the past to the present and then back again.
当他说到某事的时候，讲的动词时态都不一样，从过去时到现在时，再转回去。
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