| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [modal v] have been a [noun] | 52 |
|
| 2 | [det] could have been [art] [noun] | 17 |
|
| 3 | [det] could have been [art] [noun] | 17 |
|
| 4 | [det] could have been a [noun] | 10 |
|
| 5 | [det] could have [been] a [noun] | 7 |
|
| 6 | [det] could have be a [noun] | 7 |
|
| 7 | [det] could have [be] a [noun] | 7 |
|
| 8 | [det] could [verb] been a [noun] | 7 |
|
| 9 | [adj] could have been a [noun] | 7 |
|
