| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] [prep] a | 9383 |
|
| 2 | [modal v] [verb] [prep] a | 9383 |
|
| 3 | could [verb] [prep] [art] | 3268 |
|
| 4 | could [verb] [prep] a | 1246 |
|
