Vocabulary: Keep on

‘Why do you have a donkey, but you don’t ride it? Donkeys should be ridden.’ So the man said to his son, ‘Get on the donkey and ride it.’ They kept on going. A few hours later, a group of old women walked past. ‘Look at that lazy young boy,’ said one of the women. ‘Shame on him! He makes his father walk while he rides. His father should ride on the horse.’