Unit 13. Present perfect and past 1 (I have done and I did).
Unit 13; Part A
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The present perfect (something has happened) is a present tense. It always tells us about the situation now. 'Tom has lost his key' = he doesn't have his key now (see Unit 7). The past simple (something happened) tells us only about the past. If somebody says 'Tom lost his key', this doesn't tell us whether he has the key now or not. It tells us only that he lost his key at some time in the past. Do not use the present perfect if the situation now is different. Compare: • They've gone away. They'll be back on Friday. (they are away now) They went away, but I think they're back at home now. (not They've gone) • It has stopped raining now, so we don't need the umbrella. (it isn't raining now) It stopped raining for a while, but now it's raining again. (not It has stopped) |
Unit 13; Part B

• 'I've repaired the TV. It's working OK now.' 'Oh, that's good.'
• Have you heard the news? Sally has won the lottery!
Use the past simple (not the present perfect) for things that are not recent or new:
• Mozart was a composer. He wrote more than 600 pieces of music.
(not has been ... has written)
• My mother grew up in Scotland. (not has grown)
Compare:
• Did you know that somebody has invented a new type of washing machine?
• Who invented the telephone? (not has invented)
Unit 13; Part C

• A: Ow! I've burnt myself.
B: How did you do that? (not have you done)
A: I picked up a hot dish. (not have picked)
• A: Look! Somebody has spilt something on the sofa.
B: Well, it wasn't me. I didn't do it. (not hasn't been ... haven't done)
Exercises
![]() | Unit 12 Unit 13 Unit 14 | ![]() |
Благодаря использованию проверенных эффективных решений раскрутка сайтав компании "Суперпозиция" позволяет добиваться желаемых результатов в короткиесроки.