| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have be [vb pp] by | 131 |
|
| 2 | could have be [verb] by | 131 |
|
| 3 | could have been [verb] by | 131 |
|
| 4 | could have be [verb] by | 130 |
|
| 5 | could have be avoid by | 14 |
|
| 6 | could have be avoided by | 14 |
|
| 7 | could have be cause by | 11 |
|
| 8 | could have be caused by | 11 |
|
