| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not account for | 58 |
|
| 2 | [modal v] not account for | 58 |
|
| 3 | can not account for | 34 |
|
| 4 | can not account for | 34 |
|
| 5 | could not account for | 14 |
|
| 6 | could not account for | 14 |
|
