| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could well have [be] | 70 |
|
| 2 | could well [verb] be | 70 |
|
| 3 | could well have [be] | 70 |
|
| 4 | could well [vb infin] [be] | 70 |
|
| 5 | could well [verb] [been] | 70 |
|
| 6 | could well [verb] been | 70 |
|
