以上来源于: WordNet
ADJ In grammar, the present perfect tenses of a verb are the ones used to talk about things that happened before the time you are speaking or writing but are relevant to the present situation, or things that began in the past and are still happening. The simple present perfect tense uses "have" or "has" and the past participle of the verb, as in "They have decided what to do." 现在完成时的 [ADJ n]
The present perfect is covered in Unit 8.
现在完成时在第8单元讲解。
'I have eaten' is the present perfect tense of the verb 'to eat', 'I had eaten' is the past perfect and 'I will have eaten' is the future perfect.
I have eaten是动词eat的现在完成时；I had eaten是过去完成时；I will have eaten是将来完成时。
When we use the present perfect, there is a connection with now.
当我们使用现在完成式时，是和现在有关联的。
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