| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [verb] account for | 25 |
|
| 2 | could be [verb] [verb] for | 23 |
|
| 3 | could be [verb] account [prep] | 7 |
|
| 4 | could be [verb] account [prep] | 7 |
|
| 5 | could be [verb] account for | 5 |
|
| 6 | could [be] [verb] account for | 5 |
|
| 7 | could be [verb] account for | 5 |
|
| 8 | could [be] [verb] account for | 5 |
|
