| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] [be] [vb pp] by [noun] | 170 |
|
| 2 | could [verb] [be] [vb pp] [prep] [noun] | 113 |
|
| 3 | could [verb] [be] [verb] by [noun] | 27 |
|
