| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have been [verb] [prep] | 541 |
|
| 2 | [modal v] have been [verb] about | 39 |
|
| 3 | could have [be] [verb] about | 10 |
|
| 4 | could have [been] [verb] about | 10 |
|
| 5 | could [verb] been [verb] about | 10 |
|
| 6 | could have be [verb] about | 10 |
|
