| No. | Item | Definition |
|---|---|---|
| 1. | A common cause is | Names a frequent cause |
| 2. | A contributing factor is | Names a partial cause |
| 3. | A key reason is that | Highlights an important cause |
| 4. | A likely cause is | Names a probable cause |
| 5. | A major cause is | Highlights an important cause |
| 6. | A possible cause is | Names a possible cause |
| 7. | Another cause is | Adds another cause |
| 8. | Another reason is that | Adds another cause |
| 9. | As | Introduces a reason briefly |
| 10. | At the heart of this is | Introduces the central cause |
| 11. | Because | Introduces a direct reason |
| 12. | Behind this is | Introduces an underlying cause |
| 13. | Contributing to this is | Adds a contributing cause |
| 14. | Due to | Shows the cause of something |
| 15. | For this reason, | Signals the cause clearly |
| 16. | Given that | Considering that this is true |
| 17. | It appears to be due to | Suggests an apparent cause |
| 18. | It arises from | Shows what produced it |
| 19. | It can be attributed to | Assigns a cause |
| 20. | It can be explained by | Introduces the cause |
| 21. | It can be traced to | Shows the origin cause |
| 22. | It follows from | Shows logical cause |
| 23. | It happened because | Explains why it happened |
| 24. | It is brought on by | Shows what caused it |
| 25. | It is caused by | States the cause directly |
| 26. | It is driven by | Shows what powers it |
| 27. | It is due to | States the cause |
| 28. | It is explained by | Shows what accounts for it |
| 29. | It is fueled by | Shows what intensifies it |
| 30. | It is prompted by | Shows what led to it |
| 31. | It is rooted in | Shows a deep cause |
| 32. | It is triggered by | Shows what set it off |
| 33. | It is worsened by | Shows an aggravating cause |
| 34. | It may be due to | Suggests a possible cause |
| 35. | It may result from | Suggests a likely cause |
| 36. | It may stem from | Suggests a source cause |
| 37. | It occurs because | Explains why it occurs |
| 38. | It results from | Shows what caused it |
| 39. | It seems to result from | Suggests an apparent cause |
| 40. | It stems from | Shows the source cause |
| 41. | Now that | Because this has happened |
| 42. | On account of | Means because of |
| 43. | One cause is | Introduces one cause |
| 44. | One reason is that | Gives one cause |
| 45. | Owing to | Means because of |
| 46. | Part of the reason is | Gives a partial cause |
| 47. | Seeing that | Since this is true |
| 48. | Since | Introduces a reason or cause |
| 49. | Thanks to | Shows a positive cause |
| 50. | That is why | Explains the reason |
| 51. | The cause of this is | Introduces the cause |
| 52. | The direct cause is | Names the direct reason |
| 53. | The immediate cause is | Names the direct cause |
| 54. | The indirect cause is | Names a less direct cause |
| 55. | The leading cause is | Names the top cause |
| 56. | The main reason is that | States the primary cause |
| 57. | The primary cause is | Names the main cause |
| 58. | The problem started because | Explains how it began |
| 59. | The reason is that | States the cause directly |
| 60. | The root cause is | Names the basic cause |
| 61. | The source of this is | Introduces the origin cause |
| 62. | The underlying cause is | Names the deeper cause |
| 63. | This appears to be due to | Suggests an apparent cause |
| 64. | This arises from | Shows what produced it |
| 65. | This began because | Explains how it began |
| 66. | This can be attributed to | Assigns a cause |
| 67. | This can be explained by | Introduces the cause |
| 68. | This can be traced to | Shows the origin cause |
| 69. | This follows from | Shows logical cause |
| 70. | This happened because | Explains why it happened |
| 71. | This is because | Introduces an explanation |
| 72. | This is brought on by | Shows what caused it |
| 73. | This is caused by | States the cause directly |
| 74. | This is driven by | Shows what powers it |
| 75. | This is due to | States the cause |
| 76. | This is explained by | Shows what accounts for it |
| 77. | This is fueled by | Shows what intensifies it |
| 78. | This is prompted by | Shows what led to it |
| 79. | This is rooted in | Shows a deep cause |
| 80. | This is triggered by | Shows what set it off |
| 81. | This is worsened by | Shows an aggravating cause |
| 82. | This may be due to | Suggests a possible cause |
| 83. | This may result from | Suggests a likely cause |
| 84. | This may stem from | Suggests a source cause |
| 85. | This occurs because | Explains why it occurs |
| 86. | This results from | Shows what caused it |
| 87. | This seems to result from | Suggests an apparent cause |
| 88. | This started because | Explains how it began |
| 89. | This stems from | Shows the source cause |
| 90. | This was brought on by | Shows what caused it |
| 91. | This was caused by | States the cause directly |
| 92. | This was fueled by | Shows what intensified it |
| 93. | This was prompted by | Shows what led to it |
| 94. | This was triggered by | Shows what set it off |
| 95. | This was worsened by | Shows an aggravating cause |
| 96. | Underlying this is | Introduces a deeper cause |
| 97. | What caused this was | Introduces the cause directly |
| 98. | What explains this is | Introduces an explanation |
| 99. | What led to this was | Introduces the cause directly |
| 100. | What lies behind this is | Introduces the deeper cause |

