He (not/learn) his lesson by tomorrow, if he has not yet begun to study it

He will learn his lesson by tomorrow, if he has not yet begun to study it

                                               and a Dog
Once upon a time there was a horse whose name was Reginald.Every morning he was delivering milk, he usually met his friend Blackie, who was a little black dog. 
 Reginald didn’t want to be a milkman’s horse.He wanted to be a racehorse and win the Derbi.  And Blackie, who had rather short legs, wanted to be able to run very fast, like a hound. 
 One afternoon they were sitting in Reginald’s stable.Suddenly Blackie said that he had, an idea.  
«Why do we not eat coal?» — he said. «Trains eat coal a run fast.»
  
They thought about this for a long time, and at last Reginald said: «Let’s try it,» 
 So they went down to the coal cellar. They were going to take some some coal, when Mrs Marry, the landlady, came in.
  «What! You are stealing my coal!» —  she began to cry, and she picked up a piece of coal and threw it at them.They ran away. They had never run so fast in their lives before.
 Just then the Mayor was looking out of the window.  
«Oh, that horse can run fast I’m sure it can win the Derby, look at the dog; it’s a real hound I’ll give them each a medal.» And he did. 

Mardi Gras - an ancient Russian folk festival , was transformed into a moment of pre-Christian times , remaining after the Baptism of Russia . Mardi Gras has been accepted by the church as their own religious holiday and renamed Cheese week. However, the essence of the carnival it has not changed . Mardi Gras falls on the week , the upcoming Lent . For this reason, at this time people were resting in front of a heavy and long Lent. Mardi Gras is always celebrated with a very abundant feast . During the celebration of the carnival was made to eat a lot. Some believed the people that whoever Carnival meet in sadness , boredom and spend the whole year until the next winter wires . Shrovetide uncontrollable eating all sorts of dishes and fun is a harbinger of prosperity and success in the home and business endeavors. Pancakes required "satellite" Carnival , symbolized the sun. Time passes, life , with the Baptism of Russia , new holidays, but continued to celebrate carnival . Shrove Tuesday met with the same irrepressible joy that in the Old Slavic century.Mardi Gras - it's not a day of celebration. This weekly ritual feast with driving round dances , dances , songs and merrymaking . An important element is the burning rag stuffed Winter.Farewell to the Carnival ended with the first day of the Orthodox Great Lent " Clean Monday , " is considered the day of circumcision . Clean Monday necessarily all residents washed in the bath , washed the dishes and cleaned utensils .