The signal knock, the demand for a number, and the reply "Correct." Two knocks followed in quick succession on the door below.
Two knocks could be heard in quick succession on the door below after the signal knock and the reply.
The signal knock and the demand for the number were incorrect according to the reply.
A boy is sitting in a boat with his family  on the ocean.
Some people are in snow.
They cannot get the one in order without the other suffering.
A girl is riding on a train wearing sunglasses and a hat.
A man is standing inside.
A man plays with his beard.