| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [adv] have | 1770 |
|
| 2 | we could [adv] [verb] | 1401 |
|
| 3 | we [vb mod] [adv] have | 1224 |
|
| 4 | we [modal v] [adv] have | 1224 |
|
| 5 | we could [adv] have | 126 |
|
