| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have be [noun] [noun] | 15 |
|
| 2 | could have been [noun] [noun] | 15 |
|
| 3 | could have be [noun prp] [noun] | 12 |
|
| 4 | could have be [noun] [noun prp] | 10 |
|
| 5 | could have be [noun] [noun sg] | 5 |
|
