| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] at [art] | 13 |
|
| 2 | could have [vb pp] at [art] | 13 |
|
| 3 | could have [vb pp] at the | 10 |
|
| 4 | could have [vb pp] at the | 10 |
|
