1. 2ND DECLENSION (in –us, -er)
If the nominative singular ends in –er, all the other endings are added after this instead of replacing it. The `e’ is retained in words like puer (puerum, puerī etc.) but dropped in those like ager (agrum, agrī etc.)

2. SINGULAR (MASCULINE) Nominative Accusative Genitive Dative Ablative
VARIOUS subject
Accusative
um object
Genitive
ī of _____
Dative
ō to/for ______
Ablative
ō by/with/from _________

3. PLURAL Nominative Accusative Genitive Dative Ablative ī subject
ōs object
Genitive
ōrum of _____
Dative
īs to/for ______
Ablative
īs by/with/from _________

4. equō

5. to/for horse by/with/from horse

6. servō

7. to/for slave by/with/from slave

8. dominum

9. master (obj)

10. gladiîs

11. to/for swords by/with/from swords

12. cibus

13. food (subj)

14. amīcīs

15. to/for friends by/with/from friends

16. lupī

17. wolves (subj) of wolf

18. porcum

19. pig (obj)

20. crocodīlus

21. crocodile (subj)

22. medicōrum

23. of doctors

24. magistrōs

25. teachers (obj)

26. puerum

27. boy (obj)

28. servōs

29. slaves (obj)

30. cibum

31. food (obj)

32. gladiōs

33. swords (obj)

34. lupîs

35. to/for wolves by/with/from wolves

36. amīcus

37. friend (subj)

38. porcō

39. to/for pig by/with/from pig

40. crocodīlōs

41. crocodiles (obj)

42. puerōs

43. boys (obj)

44. agrum

45. field (obj)

46. equōrum

47. of horses

48. agrîs

49. to/for fields by/with fields

50. equum

51. horse (obj)

52. magistrī

53. teachers (subj) of teacher

54. gladium

55. sword (obj)

56. crocodīlus

57. crocodile (subj)

58. servus

59. slave (subj)

60. discipulum

61. student (obj)

62. puerō

63. for/by boy by/with/from boy

64. medicōs

65. doctors (obj)

66. agrī

67. fields (subj) of field

68. equī

69. horses (subj) of horse

70. gladium

71. sword (obj)

72. dominōrum

73. of masters

74. medicī

75. doctors (subj) of doctor

76. puerīs

77. to/for boys by/with/from boys

78. magister

79. teacher (subj)

80. medicōrum

81. of doctors

82. lupīs

83. to/for wolves by/with wolves

84. fīlius

85. son (subj)

86. puerōrum

87. of boys

88. fīlium

89. son (obj)

90. domine

91. master (voc)

92. agrōrum

93. of fields

94. fīliī

95. of son sons (subj)

96. lupe

97. wolf (voc)

98. serve

99. slave (voc)

100. gladiōrum

101. of swords