| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [det] [noun] | 173 |
|
| 2 | could have been [adj] [noun] | 57 |
|
| 3 | could [verb] been [det] [noun] | 30 |
|
| 4 | could have [be] [det] [noun] | 30 |
|
| 5 | could have be [det] [noun] | 30 |
|
| 6 | could have [been] [det] [noun] | 30 |
|
