| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [be] that | 7 |
|
| 2 | could not have [be] that | 6 |
|
| 3 | could [not/n't] have [be] that | 6 |
|
| 4 | could n't have [be] that | 6 |
|
