Have You Perfected the Perfect Tenses?

---

---

Mindmap

It comes from the Latin word perfectum, which means "complete."

Present Perfect

I have seen Star Wars.

• the event is finished:
• the exact time of the action is unknown or unimportant.
• the experience of seeing Star Wars has some effect in the present

the difference between the simple past and present perfect:
when there is a specific time:

• "I saw Star Wars last night."
  unknown or unimportant:
• "I have seen Star Wars before."
• "I have seen Star Wars in the past."
• "I have seen Star Wars three times."

Words in This Story

word	meaning	出处	含义	关联

原文

资源

mp3
pdf