| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [noun pl] could [adv] have [verb] | 9 |
|
| 2 | [det] [noun pl] could [adv] have [vb pp] | 9 |
|
| 3 | [det] [noun pl] could [adv] have [verb] | 6 |
|
