| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] been [det] [noun] | 30 |
|
| 2 | could [verb] been [det] [noun] | 30 |
|
| 3 | could have been [det] [noun] | 30 |
|
| 4 | could have been [det] [noun] | 29 |
|
| 5 | could [verb] been [det] [noun sg] | 27 |
|
| 6 | could [verb] been any [noun] | 10 |
|
| 7 | could [verb] been some [noun] | 5 |
|
