| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [pron] could [adv] [verb] | 754 |
|
| 2 | [subord] they [modal v] [adv] [verb] | 444 |
|
| 3 | [subord] they could [adv] [verb] | 262 |
|
| 4 | [conj] they could [adv] [verb] | 210 |
|
