| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not have [vb pp] a better | 32 |
|
| 2 | could not have [vb pp] a [adj -er] | 21 |
|
| 3 | could n't have [vb pp] a [adj -er] | 18 |
|
| 4 | could not have chosen a [adj -er] | 12 |
|
| 5 | could not have had a [adj -er] | 8 |
|
| 6 | could not have made a [adj -er] | 5 |
|
