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They are used as auxiliaries to the present and past perfect tenses.
它们是用作现在完成时和过去完成时的助动词。
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。
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