| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [verb] [prep] | 163 |
|
| 2 | [conj] [adv] have [verb] [prep] | 124 |
|
| 3 | [conj] could [adv] [verb] [prep] | 85 |
|
| 4 | [conj] could have [verb] [prep] | 38 |
|
| 5 | [conj] could [adv] have [verb] | 36 |
|
