| 1. | The verb must be in the present perfect tense
动词必须用现在完成时态。
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| 2. | " recently " has the widest use , in positive and negative statements and questions , with the past tense and the present perfect tense
“recently”用法最广，可用于肯定式陈述句、否定式陈述句及疑问句中，与过去时态和现在完成时态连用。
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| 3. | To grasp the usage of the present perfect tense
掌握现在完成时态的用法
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| 4. | Past future perfect tense
过去将来完成时
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| 5. | Let me try to help you understand . perfect tense shows relative time between events
完成时表示的是事情之间的时间关系：
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| 6. | Past perfect tense is used to say that one past event happened before another
过去完成时指的是事情发生在过去的时间之前。
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| 7. | The perfect tense
完成式完成时态
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| 8. | Present perfect tense
过去完成时
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| 9. | Future perfect tense
将来完成时
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| 10. | Past perfect tense
现在完成时
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