| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] | 15987 |
|
| 2 | [det] could [be] | 1468 |
|
| 3 | [det] could [verb] | 1314 |
|
| 4 | [det] [be] [verb] | 745 |
|
