Theory:

An Anagram is a word or phrase which is formed by rearranging the letters of another word or phrase.
Example:
1. Lemon - Melon
2. Great - Grate
3. Star - Rats
An antigram is an anagram which gives the opposite meaning to the original word or phrase.
Example:
1. United - Untied
2. Earliest - Arise late
3. Harmfulness - Harmless fun
 
A list of anagrams from the lesson "The Three Questions":
  1. weak - wake
  2. answers - rawness
  3. being - binge
  4. lived - devil
  5. none - neon
  6. how - who
  7. thin - hint
  8. was- saw
  9. what - thaw
  10. great - grate
  11. for - fro
  12. came - mace
  13. live - evil
  14. done - node
  15. its - sit
  16. time - mite
  17. but - tub
  18. laid - dial
  19. said - dais
  20. priests - stripes
  21. each - ache
  22. stuck - tucks
  23. earth - heart
  24. three - there
  25. spat - past, pats
  26. rose - sore
  27. send - ends
  28. now - won
  29. sink - skin
  30. pressed - depress
  31. towel - owlet
  32. stop - post, pots
  33. asleep - please
  34. outside - tedious
  35. night - thing
  36. swore - worse
  37. serve - verse
  38. mean - name, mane
  39. dealings - leadings
  40. file - life