| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have been [art] [num ord] | 7 |
|
| 2 | could have be [art] [num ord] | 7 |
|
| 3 | could have [be] [art] [num ord] | 7 |
|
| 4 | could have [been] [art] [num ord] | 7 |
|
| 5 | could have [vb pp] [art] [num ord] | 7 |
|
| 6 | could have [verb] [art] [num ord] | 7 |
|
