eat an apple / eat an orange
He didn't eat an orange.
He ate an apple.
They didn't go by car.
They went by bus.
They didn't go shopping.
They went to the cinema.
They didn't meet a friend.
They met a neighbour.
He didn't buy a camera.
He bought a television.
They didn't swim in the river.
They swam in the swimming pool.
She didn't read a magazine.
She read a book.
They didn't run about the house.
They ran in the garden.
She didn't write an e-mail.
She wrote a letter.
They didn't get a postcard.
They got a parcel.