We use the Present Perfect to say that an action happened at an unspecified time before now; the exact time is not important; the action happened at any time up to the present.
Form:
Subject + Has/Have + Past Participle
Example: You have studied psychology.
You haven't studied psychology.
Yes or No question with short answer:
Have you studied psychology?
- No, I haven't.
- Yes, I have.
Information question:
Wh + have/has + subject + past participle
Where have you studied?
The past participle of regular verbs is the same as the simple past form ( verb + -ed ); irregular verbs have special past participle forms.
Practice:
http://www.ejerciciosinglesonline.com/new-exercises/ex1-presente-perfecto-simple/
http://www.ejerciciosinglesonline.com/exercises-and-theory/ex1-present-perfect/
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