| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have be | 984 |
|
| 2 | could n't have be | 185 |
|
| 3 | could n't [adv] have | 65 |
|
| 4 | could n't [adv] be | 62 |
|
| 5 | n't [adv] have be | 35 |
|
