| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [prep] [be] | 269 |
|
| 2 | could [vb infin] [prep] [be] | 268 |
|
| 3 | [modal v] do [prep] [be] | 21 |
|
| 4 | could do [prep] [be] | 14 |
|
