| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] a | 273 |
|
| 2 | could [pers pn] have [vb pp] | 273 |
|
| 3 | could [pers pn] have a | 73 |
|
| 4 | [pers pn] have [vb pp] a | 33 |
|
