What's just happened?
He's just washed his/the car.
What's just happened?
They've just eaten the lunch/food/dinner.
What's just happened?
She's just jumped out of a plane / She's just done a parachute jump.
What's just happened?
She's just baed/made a cake.
What's just happened?
They've just had an argument.
What's just happened?
She's just got/received good news / She's just won the lottery.
What's just happened?
She's just been to the bank. She's just robbed the bank.
What's just happened?
They've just scored a goal. They've just won the match.
What's just happened?
She's just woken up. She's just got up.
What's just happened?
He's just hit his finger.
What's just happened?
He's just fallen off his bike.
What's just happened?
He's just finished washing up/washing the dishes.
What's just happened?
It's just broken a vase.