| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have be [noun] | 94 |
|
| 2 | could have [been] [noun] | 93 |
|
| 3 | could have been [noun] | 93 |
|
| 4 | could have [be] [noun prp] | 39 |
|
| 5 | could have [be] [noun sg] | 34 |
|
| 6 | could have [be] [noun pl] | 20 |
|
