| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [vb past] [pron] could [adv] [vb infin] | 35 |
|
| 2 | [adv] [vb past] they [modal v] [adv] [vb infin] | 12 |
|
| 3 | [adv] [verb] they could [adv] [vb infin] | 10 |
|
| 4 | [adv] [vb past] they could [adv] [verb] | 6 |
|
