| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [verb] | 170330 |
|
| 2 | could be [verb] | 15990 |
|
| 3 | could [be] [verb] | 15990 |
|
| 4 | could [be] [verb] | 15987 |
|
