| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [verb] a | 2641 |
|
| 2 | [pron] [verb] at a | 797 |
|
| 3 | [pron] could [verb] at | 319 |
|
| 4 | could [verb] at a | 27 |
|
