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Unit 19 :
I have done … / I did …
I have done … / I did … Present Perfect Tense& Simple Past Tense 1
His car is dirty.
He is washing his car.
He has washed his car.(= his car is clean now.)
They are at home.
They are going out.
They have gone out.(= they are not at home now.)
Use to show “the past actions that affect the present”
1. I’ve lost my wallet. (= I can’t find my wallet now.)
2. “Where’s Zoe?” “She’s gone to bed.” (= she is in bed now.)
3. We’ve bought a new car. (= we have a new car now.)
4. It’s Kate’s birthday tomorrow, and I haven’t bought her a present. (= I don’t have a present for her now.)
5. “Iris is away on vacation.” “Oh, where has she gone?” (= where is she now?)
6. Have you met my brother, or should I introduce you?
7. I was a very slow typist in college, but I’ve gotten faster.
You can also use “simple past tense” to express
1. “Where’s your wallet?” “I’ve lost it./ I lost it.”
2. “Is Ben here?” “No, he’s gone home./ He went home.”
3. We’ve bought a new car./ We bought a new car.
You can only use “Simple past tense” when mention about time
1. I lost my key yesterday. (not “I have lost”)
2. We bought a new car last week. (not “we have bought”)