| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [pron] [prep] [art] | 617 |
|
| 2 | [modal v] [vb infin] [pron] at [art] | 236 |
|
| 3 | could [verb] [pron] at [art] | 20 |
|
