| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] [prep] | 891 |
|
| 2 | could have [vb pp] [prep] | 891 |
|
| 3 | [modal v] have [vb pp] from | 449 |
|
| 4 | could have [verb] from | 76 |
|
| 5 | could [verb] [vb pp] from | 76 |
|
| 6 | could have [vb pp] from | 76 |
|
