| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] for [det] | 65 |
|
| 2 | [modal v] account for [det] | 58 |
|
| 3 | could account for [adj] | 13 |
|
| 4 | could account [prep] [det] | 11 |
|
| 5 | could account [prep] [det] | 11 |
|
| 6 | could account for [det] | 11 |
|
