1) We have not worked hard. We haven't worked hard.
I have visited them several times. I've visited them several times.
She has not finished yet. She hasn't finished yet.
They have talked to him. They've talked to him.
2) We have just cleaned the room.
I have just made the beds.
He has just phoned his friend.
The plane has just arrived.
It has just started raining.
The bus has just left.
They have just washed their hair.
You have just drunk a glass of Coke.
3)
1) We have not worked hard. We haven't worked hard.
I have visited them several times. I've visited them several times.
She has not finished yet. She hasn't finished yet.
They have talked to him. They've talked to him.
2) We have just cleaned the room.
I have just made the beds.
He has just phoned his friend.
The plane has just arrived.
It has just started raining.
The bus has just left.
They have just washed their hair.
You have just drunk a glass of Coke.
3)
had