unit 1. There is ~.
unit 2. I have been ~.
unit 3. Are you/they ~? Is he/she ~?
unit 4. Can I/you ~?
unit 5. May I ~?
unit 6. Do you ~?
unit 7. Do you want ~?
unit 8. What is ~?
unit 9 What do ~?
unit 10. Where is ~?
unit 11. Where do/does ~?
unit 12. Where can I ~? / What can I ~?
unit 13. How is/are ~?
unit 14. How do/does ~?
unit 15. How can ~?
unit 16. When is/are ~?
unit 17. When do/does ~?
unit 18. Where can you ~?
unit 19. always / often / usually
unit 20. sometimes / rarely / never
unit 21. Have you ever ~?
unit 22. Which ~?
unit 23. Who/Whose ~?
unit 24. need to / have to / must
unit 25. Let’s ~. / How about ~? / Why don’t we ~?
unit 26. prefer / like better / would rather
unit 27. either / neither
unit 28. as ~ as …
unit 29. more / most
unit 30. 여러 가지 수동태 표현 1
unit 31. 여러 가지 수동태 표현 2
unit 32. used to
unit 33. It is ~ that …
unit 34. who / whom
unit 35. which
unit 36. if
unit 37. whether ~ (or not)
unit 38. would better
unit 39. It seems ~.
unit 40. I’m sorry ~.