| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could have been [verb] | 98 |
|
| 2 | it could have been [verb] | 98 |
|
| 3 | it could have been [vb pp] | 96 |
|
| 4 | it could have been [verb] | 95 |
|
| 5 | it could have been make | 6 |
|
| 6 | it could have been done | 6 |
|
| 7 | it could have been made | 6 |
|
| 8 | it could have been do | 6 |
|
| 9 | it could have been avoid | 5 |
|
| 10 | it could have been say | 5 |
|
| 11 | it could have been avoided | 5 |
|
