很多人对这一点很难理解,其实如果给一个完整的环境来看就非常简单.比如你说的句子,如果是有人对你说Please open the door.
那么你可以回答 I have opened the door.这句话的隐含意思就是说The door is open now.（这就是你说的句子中的动作的结果）
再比如,有人邀请你Would you like to have an apple,please?
你回答：I have had one.就等于说Thank you,but I don't want any more.（这也是结果）
慢慢体会