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。