| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] could [adv] have [vb pp] | 974 |
|
| 2 | [pers pn] could have [vb pp] a | 150 |
|
| 3 | could [adv] have [vb pp] a | 130 |
|
| 4 | [pers pn] could [adv] have a | 60 |
|
| 5 | [pers pn] [adv] have [vb pp] a | 7 |
|
