| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] a [adj] | 113 |
|
| 2 | [modal v] have [vb pp] a [adj -er] | 103 |
|
| 3 | could have [vb pp] [art] [adj -er] | 21 |
|
| 4 | could have [vb pp] [art] [adj -er] | 21 |
|
| 5 | could [verb] [vb pp] a [adj -er] | 18 |
|
| 6 | could have [vb pp] a [adj -er] | 18 |
|
| 7 | could [vb infin] [vb pp] a [adj -er] | 18 |
|
| 8 | could have [verb] a [adj -er] | 18 |
|
| 9 | could have [vb pp] a [adj -er] | 18 |
|
