| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pers pn] [vb infin] [adv] | 317 |
|
| 2 | [modal v] [pers pn] [vb infin] on | 209 |
|
| 3 | could [pron] [vb infin] on | 29 |
|
| 4 | could [pers pn] [verb] on | 28 |
|
