Нужно перевести с на , : 14. мама марка наблюдает, как он пишет сочинение. 15. марк пишет сочинение уже два часа. 16. марк написал уже пять сочинений в этом месяце. 17. в году марк тоже писал сочинения. 18. марк писал сочинение, когда он пришёл. 19. марк писал сочинение уже долго, когда пришли его друзья. 20. марк уже написал сочинение до того как приехали его родители. 21. к концу месяца марк напишет пять сочинений. 22. в то время как мама марка будет сажать розы, он будет писать сочинение. 23. к тому времени как родители марка придут домой, он будет писать сочинение уже два часа.

14. Mark's mother watches as he writes an essay. 15. Mark writes an essay for two hours. 16. Mark wrote for five essays in this month. 17. Last year Mark also wrote essays. 18. Mark wrote an essay when he arrived. 19. Mark wrote an essay for a long time, when they came to his friends. 20. Mark has written an essay before his parents arrived. 21. By the end of the month, Mark wrote five works. 22. While the mother brand will plant the rose, he will write an essay. 23. By the time the parents of Mark will come home, he will write a composition for two hours.

14. Mark's mother watches as he writes an essay. 15. Mark writes an essay for two hours. 16. Mark wrote for five essays in this month. 17. Last year Mark also wrote essays. 18. Mark wrote an essay when he arrived. 19. Mark wrote an essay for a long time, when they came to his friends. 20. Mark has written an essay before his parents arrived. 21. By the end of the month, Mark wrote five works. 22. While the mother brand will plant the rose, he will write an essay. 23. By the time the parents of Mark will come home, he will write a composition for two hours.