| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] they could [vb infin] | 238 |
|
| 2 | [prep] [Wh det] they could | 191 |
|
| 3 | [prep] they could [vb infin] | 105 |
|
| 4 | [prep] [Wh det] could [vb infin] | 96 |
|
