| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [vb pp] [art] [adj] | 1842 |
|
| 2 | could have [vb pp] [art] | 817 |
|
| 3 | could have [art] [adj] | 260 |
|
| 4 | could have [vb pp] [adj] | 113 |
|
