| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] a | 43903 |
|
| 2 | [modal v] [verb] a | 43903 |
|
| 3 | could [verb] [art] | 12345 |
|
| 4 | could [verb] a | 4858 |
|
