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Long form.
1. She has cleaned the house.
2. We have not worked hard.
3. I have visited them several times.
4. She has not finished yet.
5. They have talked to him.
Short form.
1. She's cleaned the house.
2. We haven't worked hard.
3. I've visited them several times
4. She hasn't finished yet.
5. They've talked to him.