| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [vb pp] | 1824 |
|
| 2 | [noun pl] [adv] have [vb pp] | 376 |
|
| 3 | [noun pl] could have [vb pp] | 251 |
|
| 4 | [noun pl] could [adv] have | 195 |
|
