| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] could n't have [vb pp] a | 28 |
|
| 2 | [pers pn] could not have [vb pp] a | 20 |
|
| 3 | i could not have [vb pp] a | 16 |
|
| 4 | he could not have [vb pp] a | 15 |
|
| 5 | [pers pn] could not have chosen a | 10 |
|
| 6 | [pers pn] could not have had a | 8 |
|
| 7 | she could not have [vb pp] a | 7 |
|
