| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh adv] they [verb] | 576 |
|
| 2 | [Wh adv] they could [verb] | 113 |
|
| 3 | [prep] they could [verb] | 106 |
|
| 4 | [prep] [Wh adv] they could | 22 |
|
