词形转换归纳（一） [Units 1-5]
1. stomach → (名词) 胃痛；腹痛 stomachache
2. foot → (复数) feet
3. tooth → (复数) teeth → (名词) 牙痛 toothache
4. climb → (名词) 登山者；攀登者 climber
5. feel → (名词) feeling → (过去式) felt
6. own → (名词) owner
7. break → (形容词) broken
8. train → (名词) 训练；培训 training
9. kind → (名词) 善良 kindness
10. strong → (反义词) weak
11. borrow → (反义词) lend
12. independent → (名词) independence
13. develop → (名词) development
14. fair → (名词) fairness → (反义词) unfair
15. ill → (名词) illness
16. communicate → (名词) communication
17. second → (副词) secondly
18. usual → (反义词) unusual → (副词) usually
19. heavy → (副词) heavily → (反义词) light
20. sudden → (副词) suddenly
21. strange → (名词) stranger
22. wood → (形容词) wooden
23.fall → (形容词) fallen/falling → (过去式) fell →(过去分词) fallen
24. ice → (形容词) icy
25.silence → (形容词) silent→ (形容词的近义词)quiet → (形容词的反义词) noisy
26. hit → (过去式) hit → (过去分词) hit
27. hurt → (过去式) hurt → (过去分词) hurt
28.　lie (躺；平躺) → (过去式) lay → (过去分词) lain →(现在分词) lying
29. death → (形容词) dead
30. interest → (形容词) interesting/interested
31. difficult → (名词) difficulty
32. satisfy → (名词) satisfaction
33. sweep → (过去式) swept → (过去分词) swept
34. throw → (过去式) threw → (过去分词) thrown
35. beat → (过去式weigh名词) beat → (过去分词) beaten
36. complete → (副词) completely
37.sleep → (形容词) sleepy/asleep → (过去式) slept→ (过去分词) slept
38. knife → (复数) knives
39. important → (名词) importance
40. decision → (动词) decide
41. understand → (形容词) 善解人意的 understanding→ (过去式) understood
42. lend → (过去式) lent → (过去分词) lent
43. begin → (过去式) began → (过去分词) begun
44. rise → (过去式) rose → (过去分词) risen
45. true → (名词) truth
词形转换归纳（二） [Units 6-10]
1. shoot → (过去式) shot → (过去分词) shot
2. marry → (过去式) married
3. wife → (对应词) husband
4. shine → (合成词) 阳光 sunshine
5. tour → (名词) 观光者 tourist
6. achieve → (名词) achievement
7. protect → (名词) protection
8. weigh → (名词) weight
9. keep → (名词) keeper
10. excite → (名词) excitement → (形容词) 令人兴奋的
exciting → (形容词) 感到兴奋的 excited
11. Western → (名词) West
12. French → (名词) 法国 France
13. laugh → (名词) 笑声 laughter
14. introduce → (名词) introduction
15. freeze → (形容词) 极冷的；冰冻的 freezing
16.invent → (名词) 发明 invention → (名词) 发明者inventor
17.German → (复数) Germans → (名词) 德国Germany
18. Japan → (名词) 日本人 Japanese
19. stupid → (同义词) silly/foolish
20. memory → (动词) memorize
21. scarf → (复数) scarfs/scarves
22. certain → (副词) certainly
23. make → (名词) maker
24. most → (副词) mostly
25. fox → (复数) foxes
26. hide → (过去式) hid → (过去分词) hidden
27. lead → (过去式) led → (过去分词) led
28. shine → (过去式) shone → (现在分词) shining
29. brave → (副词) bravely
30. deep → (名词) depth
31. wide → (副词) widely
32. include → (介词) including
33.succeed → (名词) success → (形容词) successful→ (副词) successfully
34. believable → (反义词) unbelievable
35. it → (反身代词) itself
36. simple → (副词) simply
37. peace → (形容词) peaceful
38. safe → (名词) safety
39. soft → (副词) softly
40. century → (复数) centuries
41. hold → (过去式) held → (过去分词) held
42. truth → (形容词) 诚实的 truthful
43. especial → (副词) especially