Как ответить на почему урок для меня сложный

1. Open / close
2. Bought
3. Were having / stroke
4. Will have completed
5. I will be lying
6. Turns / checks
7. Haven’t finished
8. Is playing (план, намерение)
9. Read («рэд» вторая форма глагола)
10. Had already been waiting/ arrived
11. Are you doing (спрашивается о планах) / will start
12. Is going to faint
13. Have been living
14. Have worked
15. Have been painting
16. Is playing
17. Are you doing
18. I ever tried
19. Has just opened / started
20. Watched
21. Had never been
22. Will be seeing
23. Is playing
24. Usually has
25. Is talking
26. Slept
27. I don’t often go / do you go
28. Wore
29. Will have graduated
30. Did you do / was shaking

1.My father  (works) with computers. 2. He (is planning) to finish his research in a year. 3. Children in England usually (start) school at the age of five. 4. I  ( remembered) her telephone number very quickly. 5. Yesterday in the morning I was away. I (was taking) exam. 6. Robert Koch ( discovered) tuberculous bacilli. 7. You cannot speak to the Head of the department. He (is delivering) a lecture. 8. Next year students  (will learn) microbiology. 9. We (are waiting) for the doctor. 10. After finishing school some of my friends ( entered) the medical university. 11. Our teacher ( speaks) two foreign languages. 12. He is very busy now. He  (is making) an experiment in the laboratory.