| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] [verb] a | 2234 |
|
| 2 | could [verb] [been] [verb] | 1153 |
|
| 3 | could [verb] [verb] a | 458 |
|
| 4 | could [verb] [been] a | 265 |
|
