| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] been | 982 |
|
| 2 | could [adv] [verb] in | 416 |
|
| 3 | [adv] [verb] been in | 154 |
|
| 4 | could [verb] been in | 41 |
|
