| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] this could have been [verb] | 5 |
|
| 2 | this [noun] could have been [verb] | 19 |
|
| 3 | this [noun sg] could have been [verb] | 19 |
|
| 4 | this could [adv] have been [verb] | 9 |
|
| 5 | this could [adv] have been [verb] | 7 |
|
| 6 | this could have been [verb] [prep] | 12 |
|
| 7 | this could have been [verb] [prep] | 12 |
|
