| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not have [vb pp] a | 82 |
|
| 2 | not have [vb pp] a [adj -er] | 41 |
|
| 3 | could have [vb pp] a [adj -er] | 18 |
|
| 4 | could not have a [adj -er] | 10 |
|
