| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not have been [adj] | 116 |
|
| 2 | [vb mod] not have been [det] | 80 |
|
| 3 | [modal v] not have been [det] | 80 |
|
| 4 | could [adv] have been [det] | 25 |
|
| 5 | could not [verb] been [det] | 19 |
|
| 6 | could not have [been] [det] | 19 |
|
| 7 | could not have be [det] | 19 |
|
| 8 | could not have [be] [det] | 19 |
|
| 9 | could not have been [det] | 19 |
|
