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Present perfect and paste (l have done and I did)

     Unit 12. Present Perfect and Past ( have done and I did)

 

 A 

It is often possible to use the present perfect (I have done) or the simple past (I did). For

 example, you can say:

  •  I've lost my key. Have you seen it? or I lost my key. Did you see it? 

But do not use the present perfect when you talk about a finished time (for example, yesterday / ten minutes ago / in 1985). Use the simple past:

  •  I lost my key yesterday. (not I've lost) 
  • It was very hot last summer. (not has been) 
  • They arrived ten minutes ago. (not have arrived)
  •  "Did you see the news on TV last night?" "No, I went to bed early." 

Use the simple past to ask When... ? or What time...?:

  •  What time / When did you finish work yesterday? (not have you finished) 

B 

Do not use the present perfect if there is no connection with the present (for example, things that hat happened a long time ago):

  •  The Chinese invented printing. (not have invented) 
  • Beethoven was a great composer. (not has been)

 Compare:

  •  Shakespeare wrote many plays.
  • My brother is a writer. He has written many books. (He still writes books.)

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