| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [modal v] have been [verb] | 529 |
|
| 2 | [conj] could have be [verb] | 88 |
|
| 3 | [conj] could [verb] been [verb] | 88 |
|
| 4 | [conj] could have [be] [verb] | 88 |
|
| 5 | [conj] could have [been] [verb] | 88 |
|
