| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] [prep] | 1546 |
|
| 2 | could [adv] [verb] been | 471 |
|
| 3 | [adv] [verb] been [prep] | 285 |
|
| 4 | could [verb] been [prep] | 99 |
|
