| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [vb pp] [prep] a [noun] | 346 |
|
| 2 | could have [vb pp] a [noun] | 146 |
|
| 3 | could have [vb pp] [prep] [noun] | 137 |
|
| 4 | could have [vb pp] [prep] a | 75 |
|
