Написать 5 предложений во времени Present Perfect, 5 предложений во времени Past Simple, используя в каждом лексику, связанную с болезнями и медициной. Использовать так называемые слова-подсказки yesterday, last week, yet, just, already и тд. Обратить внимание на них место в предложении!
Например:
He twisted his leg yesterday when he was running down the stairs.
He has never scalded his hand because he is very careful in the kitchen.

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1. степень концентрации (для увеличения) в этой стране в последнее время.2.цены электричества (поднять) уже в этом году.3. новые источники энергии ветра и воды (для разработки).4. прикладные области (для обучения) учащимся разных университетов.5. высокий уровень жизни (не достигнуть) в большинстве развивающихся стран.6.как степень конкуренции (чтобы повлиять) на увеличение числа фирм в отрасли? 7.нет изменений (чтобы сделать), чтобы отличить новый продукт от идентичных продуктов.8. сколько денег (дать) всемирный банк развивающимся странам? 9. хорошее образование (для обеспечения) большей части населения

1.I ( played) computer games yesterday. 2. I (was playing) computer games at five o'clock yesterday. 3. He (was playing) computer games from two till three yesterday. 4. We  (were playing) computer games the whole evening yesterday. 5. What was Nick ( doing) when you came to his place? 6. What were you ( doing) when I rang you up? 7. I (was not sleeping) at nine o'clock yesterday. 8. What did he ( do) yesterday? - He ( read) a book. 9. What was he ( doing) the whole evening yesterday? --He (was reading) a book. 10. Was she (sleeping) when you came home? 11. My brother (did not play) tennis yesterday. He ( played) tennis the day be­fore yesterday. 12. My sister (was not  playing) the pi­ano at four o'clock yesterday. She (was playing) the piano the whole evening. 13. When I came into the kitchen, mother (was cooking). 14. She (was cooking) the whole day yesterday. 15. We ( washed) the floor in our flat yesterday. 16. We (were washing) the floor in our flat from three till four yesterday. 17. Did you ( do) your homework yesterday? 18. Were you ( doing) your homework from eight till ten yesterday? 19. Why was she ( sleeping) at seven o'clock yesterday? 20. He (was sitting) at the table the whole evening yesterday.