| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have [be] [vb pp] [adv] | 244 |
|
| 2 | could have [be] [vb pp] [adv] | 162 |
|
| 3 | who could [be] [vb pp] [adv] | 14 |
|
| 4 | who could have [be] [vb pp] | 11 |
|
