| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] from a | 30 |
|
| 2 | could [be] [verb] from a | 30 |
|
| 3 | could [be] [vb pp] from a | 30 |
|
| 4 | could be [verb] from a | 30 |
|
