| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [adv] [vb infin] | 1854 |
|
| 2 | [Wh adv] they could [vb infin] | 112 |
|
| 3 | [Wh adv] they could [adv] | 41 |
|
| 4 | [Wh adv] could [adv] [vb infin] | 5 |
|
