sentence: A man with white shirt is standing in front of a machine. sentence:  He turned around and pointed the machine. sentence:  The machine is being shown. sentence:  A man who is wearing a white shirt keeps talking, while behind him a man in gray shirt walked and reach something in the machine. sentence:  The man in gray shirt put a powdery stuff in the machine. sentence:  He is shaking the bag. sentence:  The man in white shirt is putting cement on the wall. sentence:  The man is holding a blue long tube pointing on the wall. sentence:  The man in gray uniform used the tube/pump and spray the cement on the wall. sentence:  An old man is smoothing the cement on the wall.