| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have be [vb pp] | 1057 |
|
| 2 | all have be [vb pp] | 93 |
|
| 3 | could all be [vb pp] | 37 |
|
| 4 | could all have be | 14 |
|
| 5 | could all have [vb pp] | 11 |
|
