| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may account for | 82 |
|
| 2 | could account for | 55 |
|
| 3 | can account for | 51 |
|
| 4 | would account for | 41 |
|
| 5 | will account for | 40 |
|
| 6 | might account for | 31 |
|
| 7 | must account for | 15 |
|
| 8 | should account for | 8 |
|
