Flexible

1. 100 useful adjectives (A to M)
2. 100 useful adjectives (N to Z)
3. 100 useful adverbs
4. 100 most common verbs to know
5. 100 action and movement verbs
6. Love and Marriage
7. Trees, plants and gardening
8. Astronomy, space and the universe
9. Law and Justice
10. The bathroom
11. Describing people
12. Locate things and directions
13. Education and school
14. Family members and friends
15. Gestures and positions
16. War and Peace
17. History and the past
18. Culture and hobbies
19. Music and musical instruments
20. Sport and fitness
21. Money, banking, finance
22. The house
23. Household chores
24. The weather, the climate
25. Geography and landscape
26. Environment and ecology
27. Natural disasters
28. Materials
29. Religions
30. Science
31. Around town
32. Head and face
33. The human body
34. Journalism & medias
35. Shopping
36. Travel and tourism
37. The five senses
38. Colours and shapes
39. Fruits
40. Vegetables
41. Pets & Domestic animals
42. Wildlife and Zoo Animals
43. Aquatic Animals
44. Insects
45. Birds
46. The calendar (days, months, seasons)
47. Jobs and occupations
48. Countries and continents of the world
49. Nationalities
50. Computer and Internet terms
51. Kitchen utensils
52. Essential cooking verbs
53. Food and Drinks
54. Beach and seaside
55. Politics and Government
56. Geopolitics and International Relations
57. Cinema and Movies
58. Vehicles and Transportation
59. Time and duration
60. Tools and DIY
61. Clothing and fashion accessories
62. Business
63. Geographical nouns
64. Airport and flights
65. Boat travel
66. Trains and railways
67. Opposite Words
68. Stages of life
69. Quantities, Weights and Measures
70. Acronyms & abbreviations

      I also teach these: 
  

1. Diseases and disabilities
2. Dietetics and nutrition
3. Architecture, construction and real estate
4. Health, medicine and medical care
5. Verbs of health and medicine
6. Medicines and medical equipment
7. Books and writing
8. Language and speech
9. Modern society and social problems
10. 100 communication verbs
11. Car and mechanics
12. Job search
13. Business and the world of work
14. Myths, legends and heroes
15. Identity and personal information
16. Photography
17. Accounting and taxes
18. Routine and daily life
19. Immigration and integration
20. Feelings and emotions
21. Spirit and opinion
22. Intelligence, thought
23. Personality, Character and Behaviour
24. Agriculture
25. Industry
26. Marketing and advertising
27. The hotel business
28. At the restaurant (catering)
29. Energy and natural resources