| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have | 3255 |
|
| 2 | [modal v] well have | 1194 |
|
| 3 | could well [verb] | 524 |
|
| 4 | could well [vb infin] | 517 |
|
| 5 | could well have | 164 |
|
