| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pron] [vb infin] | 3881 |
|
| 2 | could [pers pn] [vb infin] | 3733 |
|
| 3 | [modal v] they [vb infin] | 1597 |
|
| 4 | could they [verb] | 220 |
|
| 5 | could they [vb infin] | 220 |
|
