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Unit 19. I have done … (Present Perfect) and I did … (Past Simple)
(смысловые различия между предложениями в настоящем совершенном и простом прошедшем времени)

See Unit 15 I have done … (Present Perfect 1)
See Unit 16 Have you ever … (Present Perfect 2)
See Unit 17 How long have you … (Present Perfect 3)
See Unit 9 I watched/ cleaned/ went etc. (Past Simple)
See Unit 10 I didn’t … Did you …? (Past Simple negative and questions)
 
We use the Past Simple (did/ arrived/ saw/ was etc.) with a finished time (yesterday/ last week/ in 1986/ six months ago etc.):
 

past + finished time
We arrived yesterday last week at 3 o'clock in 1986 six months ago

We do not use the Present Perfect (have done / have arrived / have been etc.) with a finished time:
 
- I saw Jack yesterday. (not I have seen Jack yesterday)
- Where were you last night? (not Where have you been last night?)
- We didn't have a holiday last year. (not We haven't had)
- I got up at 7.15. I washed, dressed and then I had breakfast.
- William Shakespeare (1564-1616) was a writer. He wrote many plays and poems.
(not … has been a writer … has written many plays)
 
Use the Past Simple to ask When? or What time?:
 
- When did they arrive? (not When have they arrived?)
Compare:

Present Perfect I have lost my key. (= I can't find it now) Bill has gone home. (= he isn't here now) Have you seen Ann? (= where is she now?) Have you ever been to Spain? (= in your life, until now) My friend is a writer. He has written many book. We've lived in Singapore for six years. (we live there now)

but

Past Simple I lost my key yesterday.   Bill went home ten minutes ago.   When did you see Ann?   Did you go to Spain last year?   Shakespeare wrote many plays and poems.   We lived in Glasgow for six years but now we live in Singapore.

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