| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [vb pp] [prep] a [noun] | 3832 |
|
| 2 | could have [vb pp] a [noun] | 157 |
|
| 3 | could have [vb pp] [prep] [noun] | 140 |
|
| 4 | could have [vb pp] [prep] a | 78 |
|
