| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] [to-vb] this | 17 |
|
| 2 | could [be] [vb pp] [to-vb] this | 17 |
|
| 3 | could be [verb] [to-vb] this | 17 |
|
| 4 | could [be] [verb] to do this | 5 |
|
