| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [be] [vb pp] at [det] | 121 |
|
| 2 | could [be] [vb pp] at [det] | 54 |
|
| 3 | could have [be] [vb pp] at | 27 |
|
| 4 | could have [vb pp] at [det] | 10 |
|
| 5 | could have [be] [vb pp] [det] | 7 |
|
