| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] been [det] | 370 |
|
| 2 | could [verb] been [adj] | 354 |
|
| 3 | could [verb] [be] [det] | 74 |
|
| 4 | could [verb] be [det] | 74 |
|
| 5 | could [verb] [been] [det] | 63 |
|
