| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have [be] [vb pp] [adv] | 49 |
|
| 2 | who [modal v] have [be] [vb pp] [adv] | 14 |
|
| 3 | who could have [be] [verb] [adv] | 5 |
|
| 4 | who could [verb] [be] [vb pp] [adv] | 5 |
|
