| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] a [adv] [adj] | 7 |
|
| 2 | could have [vb pp] a [adv] [adj] | 7 |
|
| 3 | could have [vb pp] a [adv] [adj] | 6 |
|
| 4 | could have [vb pp] a [adv] [adj] | 5 |
|
