| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] by | 1302 |
|
| 2 | [modal v] [be] do by | 230 |
|
| 3 | could [be] do [prep] | 159 |
|
| 4 | could [be] do [prep] | 159 |
|
| 5 | could [be] do by | 34 |
|
