The present perfect is covered in Unit 8.

现在完成时在第8单元讲解。

《牛津词典》

'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。

《牛津词典》

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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Scientists suspected the ring might be present and had the perfect tool in the Spitzer space telescope to confirm it.

BBC: New ring detected around Saturn

This pullback could present the perfect buying opportunity.

FORBES: Buy BBBY While Shares Are Below Recent Highs

Pick-n-mix, and you have the perfect millennium present.

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