| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [vb pp] [det] a | 9 |
|
| 2 | could [adv] have [vb pp] such a | 9 |
|
| 3 | could [adv] have [vb pp] such a | 9 |
|
| 4 | could [adv] have [vb pp] [adj] a | 6 |
|
