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- the bus has already left.
- the airplane had already taken off.
- the train had already left.
- after she had seen the accident.
- after she saw the accident.
- before she has seen the accident.
- Steven had already prepared the dinner.
- Steven has already prepared the dinner.
- Steven prepared the dinner.
- I have gone out for a walk.
- I had gone out for a walk
- I went out for a walk.